Form 2441: Child and Dependent Care Credit Calculator

The child and dependent care credit on Form 2441 is a percentage of work-related expenses, with the expenses capped at $3,000 for one qualifying person or $6,000 for two or more: the final 2025 form uses percentages from 35% down to 20%, and the IRS early-release draft 2026 instructions (“DRAFT—NOT FOR FILING”) use 50% down to 20%, following Public Law 119-21 section 70405. The dependent care benefit exclusion on the same form is $5,000 ($2,500 if married filing separately) for 2025 and $7,500 ($3,750) for 2026 per the draft form (“DRAFT—NOT FOR FILING”) and section 70404, the same amounts the FedRateCalc FSA limit pages state.

Maintained by Archie Chang · Sources checked against IRS text on November 2, 2026 · Methodology & sources

Not an official source. FedRateCalc is independent and is not affiliated with the Internal Revenue Service (IRS). IRS.gov is the authority for forms, instructions and tax rules, and the quoted text on this page is copied from the IRS documents listed under Sources. This page describes what those documents say and is not tax advice. When we checked on November 2, 2026, the IRS About Form 2441 page linked the Form 2441 and Instructions for Form 2441 PDFs we saved (tax year 2025), and the IRS draft tax forms list had Form 2441, its instructions and Publication 503 for 2026 posted 05/06/2026, 08/24/2026 and 10/29/2026. The 2026 figures taken from those drafts are shown with the IRS caution “DRAFT—NOT FOR FILING”.

The credit percentage by tax year

The credit is the expenses (after the earned income and dollar limits) times a percentage that depends on adjusted gross income (AGI). Publication 503 (2025) and Tax Topic 602 put it this way:

“To determine the amount of your credit, multiply your work-related expenses (after applying the earned income and dollar limits) by a percentage. This percentage depends on your adjusted gross income shown on Form 1040, 1040-SR, or 1040-NR, line 11a.”
IRS Publication 503 (2025), “Amount of Credit”
“You may be able to claim the child and dependent care credit if you paid expenses for the care of a qualifying individual to enable you (and your spouse, if filing a joint return) to work or actively look for work. Generally, you may not take this credit if your filing status is married filing separately. However, see What's Your Filing Status? in Publication 503, Child and Dependent Care Expenses, which describes an exception for certain taxpayers living apart from their spouse and meeting other requirements.”
IRS Tax Topic 602 (page last reviewed Oct 16, 2026)

For tax year 2025 the final Form 2441 has one table. For tax year 2026 the IRS early-release draft instructions (cover page “Caution: DRAFT—NOT FOR FILING”) have a schedule with separate columns for joint filers and other filers. The draft’s What’s New text and the draft Publication 503 say:

“Changes to the credit for child and dependent care expenses. Beginning in 2026, the maximum percentage used to figure the credit for child and dependent care expenses is increased from 35% to 50%, and higher adjusted gross income phaseout thresholds apply. As adjusted gross income increases, the percentage used to figure the credit is reduced, but not below 20%. For 2026, the percentage used to figure the credit ranges from 50% to 20%, compared to 35% to 20% for 2025. Different phaseout thresholds apply for joint filers and other filers. For 2026, the 20% minimum percentage doesn’t apply until adjusted gross income exceeds $206,000 for joint filers and $103,000 for other filers. For 2025, the 20% minimum percentage applied once adjusted gross income was more than $43,000.”
IRS 2026 Instructions for Form 2441, “What’s New” (IRS early-release draft, cover page “Caution: DRAFT—NOT FOR FILING”)
“Beginning in 2026, the maximum percentage used to figure the credit for child and dependent care expenses is increased from 35% to 50%, and higher adjusted gross income phaseout thresholds apply.”
IRS Publication 503 (2026), “What’s New” (IRS early-release draft, cover page “Caution: DRAFT—NOT FOR FILING”)
Tax year 2025 (final Form 2441, line 8): decimal amount for line 7 over the first amount but not over the second, all filing statuses.
Line 7 is overBut not overDecimal amount
$0$15,000.35
$15,000$17,000.34
$17,000$19,000.33
$19,000$21,000.32
$21,000$23,000.31
$23,000$25,000.30
$25,000$27,000.29
$27,000$29,000.28
$29,000$31,000.27
$31,000$33,000.26
$33,000$35,000.25
$35,000$37,000.24
$37,000$39,000.23
$39,000$41,000.22
$41,000$43,000.21
$43,000No limit.20
Tax year 2026, filers other than married filing jointly (IRS early-release draft instructions, “2026 Phaseout Schedule”, cover page “Caution: DRAFT—NOT FOR FILING”).
Line 7 is overBut not overDecimal amount
$0$15,000.50
$15,000$17,000.49
$17,000$19,000.48
$19,000$21,000.47
$21,000$23,000.46
$23,000$25,000.45
$25,000$27,000.44
$27,000$29,000.43
$29,000$31,000.42
$31,000$33,000.41
$33,000$35,000.40
$35,000$37,000.39
$37,000$39,000.38
$39,000$41,000.37
$41,000$43,000.36
$43,000$75,000.35
$75,000$77,000.34
$77,000$79,000.33
$79,000$81,000.32
$81,000$83,000.31
$83,000$85,000.30
$85,000$87,000.29
$87,000$89,000.28
$89,000$91,000.27
$91,000$93,000.26
$93,000$95,000.25
$95,000$97,000.24
$97,000$99,000.23
$99,000$101,000.22
$101,000$103,000.21
$103,000No limit.20
Tax year 2026, married filing jointly (IRS early-release draft instructions, “2026 Phaseout Schedule”, cover page “Caution: DRAFT—NOT FOR FILING”).
Line 7 is overBut not overDecimal amount
$0$15,000.50
$15,000$17,000.49
$17,000$19,000.48
$19,000$21,000.47
$21,000$23,000.46
$23,000$25,000.45
$25,000$27,000.44
$27,000$29,000.43
$29,000$31,000.42
$31,000$33,000.41
$33,000$35,000.40
$35,000$37,000.39
$37,000$39,000.38
$39,000$41,000.37
$41,000$43,000.36
$43,000$150,000.35
$150,000$154,000.34
$154,000$158,000.33
$158,000$162,000.32
$162,000$166,000.31
$166,000$170,000.30
$170,000$174,000.29
$174,000$178,000.28
$178,000$182,000.27
$182,000$186,000.26
$186,000$190,000.25
$190,000$194,000.24
$194,000$198,000.23
$198,000$202,000.22
$202,000$206,000.21
$206,000No limit.20

The 2026 schedule follows Public Law 119-21 section 70405, which the IRS web page on the Working Families Tax Cuts also describes. The calculator’s tests compare the draft schedule with the statute’s formula at every AGI step. The statute and the IRS page say:

“Paragraph (2) of section 21(a) is amended to read as follows:
“(2) Applicable percentage defined.--For purposes of paragraph (1), the term ‘applicable percentage’ means 50 percent--

“(A) reduced (but not below 35 percent) by 1 percentage point for each $2,000 or fraction thereof by which the taxpayer's adjusted gross income for the taxable year exceeds $15,000, and

“(B) further reduced (but not below 20 percent) by 1 percentage point for each $2,000 ($4,000 in the case of a joint return) or fraction thereof by which the taxpayer's

[…]

adjusted gross income for the taxable year exceeds $75,000 ($150,000 in the case of a joint return).”.
”
Public Law 119-21, section 70405(a) (amending 26 U.S.C. 21(a)(2)), as printed by the Government Publishing Office
“The amendment made by this section shall apply to taxable years beginning after December 31, 2025.”
Public Law 119-21, section 70405(b) and section 70404(b), Effective Date
“Beginning with tax year 2026, the maximum credit rate increases from 35% to 50% of qualifying expenses, while the maximum qualifying expenses remain $3,000 for one qualifying individual and $6,000 for two or more qualifying individuals. The amount of the credit taxpayers receive depends on their income and other eligibility requirements.”
IRS, The Working Families Tax Cuts, “Child and Dependent Care Credit enhancement (Section 70405)” (final web page)

Expense limits, qualifying persons and who can claim

The expense limit is the same in both years, per Tax Topic 602 and the IRS Working Families Tax Cuts page quoted above:

“The total expenses that you may use to calculate the credit may not be more than $3,000 (for one qualifying individual) or $6,000 (for two or more qualifying individuals). Expenses paid for the care of a qualifying individual are eligible expenses if the primary reason for paying the expense is to assure the individual's well-being and protection. If you received dependent care benefits that you exclude or deduct from your income, you must subtract the amount of those benefits from the dollar limit that applies to you.”
IRS Tax Topic 602, “Dollar limit”

The 2025 instructions list who qualifies and which tests must be met:

“A qualifying person is any of the following. 1. A qualifying child under age 13 whom you can claim as a dependent. If the child turned 13 during the year, the child is a qualifying person for the part of the year they were under age 13. 2. Your disabled spouse who wasn't physically or mentally able to care for themselves and lived with you for more than half the year. 3. Any disabled person who wasn't physically or mentally able to care for themselves who lived with you for more than half the year and whom you can claim as a dependent or could claim as a dependent except: a. The disabled person had gross income of $5,200 or more, b. The disabled person filed a joint return, or c. You (or your spouse if filing jointly) could be claimed as a dependent on another taxpayer's 2025 tax return.”
IRS 2025 Instructions for Form 2441, “Qualifying Person(s)” (complete list; the instructions then add a rule for divorced or separated parents)
“You can take the credit or the exclusion if all five of the following apply. 1. Your filing status may be single, head of household, qualifying surviving spouse, or married filing jointly. If your filing status is married filing separately, see Married Persons Filing Separately, later. 2. The care was provided so you (or your spouse if filing jointly) could work or look for work. However, if you didn't find a job and have no earned income for the year, you can't take the credit or the exclusion. But if you or your spouse was a full-time student or disabled, see the instructions for lines 4 and 5, later. 3. The care must be for one or more qualifying persons. See Qualifying Person(s), earlier. 4. The person who provided the care wasn't your spouse, the parent of your qualifying child, or a person whom you can claim as a dependent. If your child (including stepchild or foster child) provided the care, they must have been age 19 or older by the end of 2025 and they can't be your dependent. 5. You report the required information about the care provider on line 1 and, if taking the credit, the information about the qualifying person on line 2.”
IRS 2025 Instructions for Form 2441, “Who Can Take the Credit or Exclude Dependent Care Benefits?” (complete list)
“You (and your spouse if filing jointly) must have earned income to take the credit or exclude dependent care benefits from your income. But see If You or Your Spouse Was a Student or Disabled, later, if either of these circumstances applies.”
IRS 2025 Instructions for Form 2441, “Purpose of Form”
“Generally, married persons must file a joint return to claim the credit. If your filing status is married filing separately and all of the following apply, you are considered unmarried for purposes of claiming the credit on Form 2441.
You lived apart from your spouse during the last 6 months of 2025.

Your home was the qualifying person's main home for more than half of 2025.

You paid more than half of the cost of keeping up that home for 2025.
”
IRS 2025 Instructions for Form 2441, “Married Persons Filing Separately”

Dependent care benefits and the FSA amount

If an employer pays dependent care benefits, Part III of Form 2441 reduces the expense limit before the credit is figured. The maximum that can be excluded under a dependent care assistance program, such as a dependent care FSA, is on line 21:

Dependent care benefit exclusion maximum by tax year. The 2026 amounts are in Public Law 119-21 section 70404 and in the IRS early-release draft Form 2441 (cover page “Caution: DRAFT—NOT FOR FILING”).
ItemTax year 2025Tax year 2026
Maximum exclusion (line 21)$5,000 (Instructions for Form 2441, 2025)$7,500 (Public Law 119-21 section 70404; draft Form 2441, DRAFT—NOT FOR FILING)
Married filing separately and required to enter the spouse’s earned income on line 19$2,500 (Instructions for Form 2441, 2025)$3,750 (Public Law 119-21 section 70404; draft Form 2441, DRAFT—NOT FOR FILING)
Expense limit, line 27$3,000 or $6,000$3,000 or $6,000

These exclusion amounts are the same ones the FSA limits 2026 and FSA limits 2027 pages state for the dependent care FSA. The IRS documents say:

“For 2025, the maximum amount that can be excluded from your income through a dependent care assistance program is $5,000 ($2,500 if married filing separately).”
IRS 2025 Instructions for Form 2441, “Line 21”
“Section 129(a)(2)(A) is amended by striking “$5,000 ($2,500” and inserting “$7,500 ($3,750”.”
Public Law 119-21, section 70404(a) (dependent care assistance program), as printed by the Government Publishing Office
“Changes to dependent care benefits. Beginning in 2026, employers may increase the maximum amount that can be excluded from an employee’s income through a dependent care assistance program. The maximum amount is increased to $7,500 (previously $5,000). For certain married employees filing separate returns, the maximum amount is increased to $3,750 (previously $2,500).”
IRS 2026 Instructions for Form 2441, “What’s New” (IRS early-release draft, cover page “Caution: DRAFT—NOT FOR FILING”)
“For married employees filing separate returns who are required to enter their spouse’s earned income on line 19, the maximum amount is increased to $3,750 (previously $2,500). Your employer can tell you whether your dependent care plan was amended to increase the amount that can be excluded.”
IRS 2026 Instructions for Form 2441, “Line 21” (IRS early-release draft, cover page “Caution: DRAFT—NOT FOR FILING”)
“Caution: If you exclude or deduct dependent care benefits that equal or exceed the $3,000 or $6,000 limit used to figure the credit, you can’t claim the credit. For example, if you exclude or deduct the full $7,500, you can’t take the credit because $7,500 is more than the $3,000 or $6,000 limit on line 27.”
IRS 2026 Instructions for Form 2441, “Line 12” (IRS early-release draft, cover page “Caution: DRAFT—NOT FOR FILING”)

Publication 503 (2025) works an example of the reduced dollar limit:

“Example 1. George is a widower with one child and earns $24,000 a year. He pays work-related expenses of $2,900 for the care of his 4-year-old child and qualifies to claim the credit for child and dependent care expenses. His employer pays directly to his dependent care provider an additional $1,000 under a qualified dependent care benefit plan. This $1,000 is excluded from George's income.”
IRS Publication 503 (2025), “Reduced Dollar Limit”, Example 1

Form 2441, line by line

The final 2025 form has Part II for the credit (lines 3 to 11 are shown) and Part III for dependent care benefits (lines 12 to 31). The 2026 draft (cover page “Caution: DRAFT—NOT FOR FILING”) differs in substance on two lines, shown after the 2025 table; the other lines are worded as in 2025 apart from the years.

Form 2441 (2025), Part II lines 3 to 11 and Part III lines 12 to 31, as printed on the form (final).
LineWhat the form says
3Add the amounts in column (d) of line 2. Don’t enter more than $3,000 if you had one qualifying person or $6,000 if you had two or more persons. If you completed Part III, enter the amount from line 31
4Enter your earned income. See instructions
5If married filing jointly, enter your spouse’s earned income (if you or your spouse was a student or was disabled, see the instructions); all others, enter the amount from line 4
6Enter the smallest of line 3, 4, or 5. If zero or less, enter -0-
7Enter the amount from Form 1040, 1040-SR, or 1040-NR, line 11a
8Enter on line 8 the decimal amount shown below that applies to the amount on line 7.
9aMultiply line 6 by the decimal amount on line 8
9bIf you paid 2024 expenses in 2025, complete Worksheet A in the instructions. Enter the amount from line 13 of the worksheet here. Otherwise, enter -0- on line 9b and go to line 9c
9cAdd lines 9a and 9b and enter the result
10Tax liability limit. Enter the amount from the Credit Limit Worksheet in the instructions
11Credit for child and dependent care expenses. Enter the smaller of line 9c or line 10 here and on Schedule 3 (Form 1040), line 2
12Enter the total amount of dependent care benefits you received in 2025. Amounts you received as an employee should be shown in box 10 of your Form(s) W-2. Don’t include amounts reported as wages in box 1 of Form(s) W-2. If you were self-employed or a partner, include amounts you received under a dependent care assistance program from your sole proprietorship or partnership
13Enter the amount, if any, you carried over from 2024 and used in 2025 during the grace period. See instructions
14Enter the amount, if any, you forfeited or carried forward to 2026. See instructions
15Combine lines 12 through 14. See instructions
16Enter the total amount of qualified expenses incurred in 2025 for the care of the qualifying person(s)
17Enter the smaller of line 15 or 16
18Enter your earned income. See instructions
19Enter the amount shown below that applies to you.
20Enter the smallest of line 17, 18, or 19. If zero or less, enter -0-
21Enter $5,000 ($2,500 if married filing separately and you were required to enter your spouse’s earned income on line 19). However, don’t enter more than the maximum amount allowed under your dependent care plan. See instructions
22Is any amount on line 12 or 13 from your sole proprietorship or partnership? No. Enter -0-. Yes. Enter the amount here
23Subtract line 22 from line 15
24Deductible benefits. Enter the smallest of line 20, 21, or 22. Also, include this amount on the appropriate line(s) of your return. See instructions
25Excluded benefits. If you checked “No” on line 22, enter the smaller of line 20 or line 21. Otherwise, subtract line 24 from the smaller of line 20 or line 21. If zero or less, enter -0-
26Taxable benefits. Subtract line 25 from line 23. If zero or less, enter -0-. Also, enter this amount on Form 1040, 1040-SR, or 1040-NR, line 1e
27Enter $3,000 ($6,000 if two or more qualifying persons)
28Add lines 24 and 25
29Subtract line 28 from line 27. If zero or less, stop. You can’t take the credit. Exception. If you paid 2024 expenses in 2025, see the instructions for line 9b
30Complete line 2 on page 1 of this form. Don’t include in column (d) any benefits shown on line 28 above. Then, add the amounts in column (d) and enter the total here
31Enter the smaller of line 29 or 30. Also, enter this amount on line 3 on page 1 of this form and complete lines 4 through 11
IRS Form 2441 (2025), cat. no. 11862M, created 3/18/25
Form 2441 (2026) as printed in the IRS early-release draft (cover page “Caution: DRAFT—NOT FOR FILING”): the two lines that differ in substance from the 2025 form.
LineWhat the form says
8Enter on line 8 the decimal amount that applies to the amount on line 7. See instructions for the amount to enter
21Enter $7,500 ($3,750 if married filing separately and you were required to enter your spouse’s earned income on line 19). However, don’t enter more than the maximum amount allowed under your dependent care plan. See instructions
IRS Form 2441 (2026) early-release draft, created 4/30/26

The credit cannot be more than the tax, which is what line 10 carries:

“The amount of credit you can claim is limited to your tax. You can't get a refund for any part of the credit that is more than this limit.”
IRS Publication 503 (2025), “How To Claim the Credit”

Calculator: credit from the Form 2441 lines

The calculator follows Part II and, when benefits are entered, Part III for an employee with an employer plan. It starts on tax year 2025, the latest year with a final form. Tax year 2026 uses the IRS early-release draft percentages and line 21 amount (“DRAFT—NOT FOR FILING”). Amounts are kept to the cent, half up, which is this site’s convention. The calculator uses the one expense amount you enter for line 16 (incurred in the year, whenever paid) and for line 30 (incurred and paid in the year, less line 28), so enter an amount that fits both.

Your figures

$
$
$
$
$
$

Assumes benefits come from an employer plan (line 22 is zero), no prior-year expenses (line 9b is zero) and no deemed student or disabled income. The one expense amount is used for line 16 (incurred) and line 30 (incurred and paid).

Form 2441 arithmetic, tax year 2025

Enter expenses, earned income for both spouses and adjusted gross income to see the lines.

The Form 1040 instructions allow a return to be rounded to whole dollars; the calculator keeps cents instead (this site’s convention), so a return rounded to whole dollars can differ by under a dollar per amount:

“You can round off cents to whole dollars on your return and schedules. If you do round to whole dollars, you must round all amounts. To round, drop amounts under 50 cents and increase amounts from 50 to 99 cents to the next dollar.”
IRS 2025 Instructions for Form 1040, “Rounding Off to Whole Dollars”
Worked examples (our arithmetic on the Form 2441 lines; the 2026 column uses the IRS early-release draft schedule, “Caution: DRAFT—NOT FOR FILING”).
CaseTax year 2025Tax year 2026
Single, one qualifying person, $3,000 of expenses, AGI $60,000: percentage and credit.20 and $600.00.35 and $1,050.00
Married filing jointly, two qualifying persons, $6,000 of expenses, AGI $160,000: percentage and credit.20 and $1,200.00.32 and $1,920.00

Related pages: child tax credit 2026, earned income credit 2026 and the paycheck calculator.

Forms and drafts the IRS had posted

The final forms we used are the 2025 revisions. The IRS draft list had these 2026 products for Form 2441:

Rows of the IRS draft tax forms list, filtered on the form number, as read on November 2, 2026 (these 2026 products are drafts, cover page “Caution: DRAFT—NOT FOR FILING”).
ProductTitleRevision datePosted date
Publication 503Tax Guide for Child and Dependent Care Expenses202610/29/2026
Instruction 2441Instructions for Form 2441, Child and Dependent Care Expenses202608/24/2026
Form 2441Child and Dependent Care Expenses202605/06/2026
“Caution: DRAFT—NOT FOR FILING This is an early release draft of an IRS tax form, instructions, or publication, which the IRS is providing for your information. Do not file draft forms.”
Cover page of the IRS early-release draft Form 2441 (2026)

What this page does not cover

  • Expenses from the prior year that were paid later (line 9b and Worksheet A), deemed income for students and disabled filers, and benefits from a sole proprietorship or partnership.
  • Married filing separately without meeting the line A requirements: the calculator gives no credit and does not figure the Part III taxable benefits that can still apply.
  • The Credit Limit Worksheet: enter its line 3 amount if you want line 10 applied.
  • Care provider reporting on Part I, household employee taxes and state credits.

Frequently asked questions

What is the child and dependent care credit on Form 2441?

IRS Tax Topic 602 says a taxpayer may be able to claim it for expenses paid for the care of a qualifying individual so the taxpayer (and a spouse, if filing jointly) could work or actively look for work, and that the credit is a percentage of the work-related expenses that depends on adjusted gross income. The expenses used cannot be more than $3,000 for one qualifying individual or $6,000 for two or more.

What percentage is used for 2025 and 2026?

For tax year 2025, the final Form 2441 table runs from .35 for adjusted gross income up to $15,000 down to .20 over $43,000. For tax year 2026, the IRS early-release draft instructions (“DRAFT—NOT FOR FILING”) run from .50 down to .20, with the 20% minimum starting over $103,000 for filers other than joint filers and over $206,000 for joint filers. Public Law 119-21 section 70405 applies to taxable years beginning after December 31, 2025.

Who is a qualifying person?

The 2025 instructions list three kinds: a qualifying child under age 13 whom the filer can claim as a dependent; the filer’s disabled spouse who was not physically or mentally able to care for themselves and lived with the filer for more than half the year; and any disabled person who was not able to care for themselves, who lived with the filer for more than half the year, and whom the filer can claim or could claim as a dependent except for certain gross income, joint return or dependent-status exceptions.

How do employer dependent care benefits change the expense limit?

Tax Topic 602 says benefits that were excluded or deducted must be subtracted from the dollar limit that applies. On Form 2441 that is Part III: line 27 is $3,000 ($6,000 for two or more qualifying persons), line 28 adds the deductible and excluded benefits, and line 29 is the remainder; if line 29 is zero or less the credit cannot be taken. Publication 503 (2025) works an example in which $1,000 of benefits cut a $3,000 limit to $2,000.

How much can be excluded under a dependent care FSA?

The 2025 Instructions for Form 2441 give $5,000 ($2,500 if married filing separately). For 2026, Public Law 119-21 section 70404 raised it to $7,500 ($3,750), and the IRS early-release draft Form 2441 (2026) line 21 prints $7,500 (“DRAFT—NOT FOR FILING”). These are the same amounts the FedRateCalc FSA limit pages state for 2026 and 2027. The instructions add that no more than the maximum under the employer’s plan may be entered.

Is the credit refundable?

Publication 503 (2025) says the amount of credit that can be claimed is limited to the filer’s tax and that no refund is available for any part of the credit over that limit. Line 10 of Form 2441 carries that tax liability limit.

Can married people filing separately claim it?

Generally not. The 2025 instructions say married persons must generally file a joint return to claim the credit, and that a person filing separately is considered unmarried only if all three tests are met: living apart from the spouse during the last 6 months of the year, the home being the qualifying person’s main home for more than half the year, and paying more than half the cost of keeping up that home. The calculator offers that case as its own filing status.

How does the calculator handle the 2026 draft figures and rounding?

The calculator starts on tax year 2025, the latest year with a final form. Choosing 2026 uses the IRS early-release draft table and line 21 amount (“DRAFT—NOT FOR FILING”), which can change before the final form. Amounts are kept to the cent, half up, which is this site’s convention because the 2025 Instructions for Form 2441 give no rounding rule for line 9a; the 2025 Instructions for Form 1040 say a return may be rounded to whole dollars (drop under 50 cents, raise 50 to 99 cents), so a whole-dollar return can differ by under a dollar per amount.