Internet TAXSIM Special for Hoynes

Internet TAXSIM

Version 8.0

Upload a file with TAXSIM data:

File to upload:
Marginal Rates (finite differences) with respect to: Other Income Wage Income Taxpayer Earnings Spouse Earnings Long Term Gains Don't bother
Show detailed intermediate calculations: Off On Labeled
Return either a URL on our server a live page.
Bush Tax Cuts as per law No EGTRRA or JGTRRA
AMT Patch as per law No AMT Patch

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OR... Calculate liabilities for one taxpayer (fill every box)

Marginal Rates with respect to: Other Income Wage Income Taxpayer Earnings Spouse Earning Long Term Gains Other deductions Mortgage Interest Don't bother
Bush Tax Cuts as per law No EGTRRA or JGTRRA
AMT Patch as per law No AMT Patch

	1. Case ID (must be numeric)
	2. Tax year (4 digits between 1960 and 2013, but state must be zero if year is before 1977 or after 2006. We don't have code for state laws before 1977.) Indexed tax parameters are inflated by X 2.5/year after 2006.
	3. State (SOI codes. These run from 1 for Alabama to 51 for Wyoming and are not the Census or PSID codes. See state list,and also item two above.). Use zero for "no state tax calculation".
	4. Marital Status (1. single 2. joint 3. head of household 8. Dependent taxpayer )
	5. Dependent Exemptions (include all children, but also see #19 below)
	6. Number of taxpayers over 65 years of age.
	7. Wage and salary income of Taxpayer (include self-employment).
	8. Wage and salary income of Spouse (include self-employment).
	9. Dividend income (corporate dividends only for 2003 on).
	10. Other property income, including interest, rent, alimony, fellowships non-corporate dividends and other income or loss not otherwise enumerated here. Adjustments such as Keogh and IRA can be entered here as negative income.(+/-)
	11. Taxable Pensions
	12. Gross Social Security Income
	13. Other non-taxable transfer Income such as welfare, municipal bond interest, and child support that would affect eligibility for state property tax rebates but would not be taxable at the federal level.
	14. Rent Paid (used only for calculating state property tax rebates)
	15. Property and other taxes paid (except state income or post-2003 formula derived sales tax, which TAXSIM calculates).
	16. Itemized deductions other than mortgage,state income tax and local property tax. If you have medical expenses remember to only include the excess over 3%,5% or 7,5% of AGI (for years 60-82, 83-86 and 87+). These are regarded as preferences for the AMT.
	17. Child care expenses.
	18. Unemployment compensation received.
	19. Number of dependents under age 17 (for child credit, not more than item 5).
	20. Mortgage Interest and other deductions not a preference for the AMT.
	21. Sort Term Capital Gains or losses. (+/-)
	22. Long Term Capital Gains or losses. (+/-)

Return either a URL on our server a live page.

The returned columns of results include:

1. Case ID
2. Year
3. State
4. Federal tax liability
5. State tax liability
6. FICA (OADSI and HI)
7. Effective federal marginal rate
8. Effective state marginal rate
9. FICA rate

   If detailed intermediate results are requested, the following are added:

10. Federal AGI
11. UI in AGI
12. Social Security in AGI
13. Zero Bracket Amount
14. Personal Exemptions
15. Exemption Phaseout
16. Deduction Phaseout
17. Deductions Allowed (Zero for non-itemizers)
18. Federal Taxable Income
19. Federal Regular Tax
20. Exemption Surtax
21. General Tax Credit
22. Child Tax Credit (as adjusted)
23. Additional Child Tax Credit (refundable)
24. Child Care Credit
25. Earned Income Credit
26. Income for the Alternative Minimum Tax
27. AMT Liability (addition to regular tax)
28. Federal Income Tax After Credits
29. FICA

    The following are zero if no state is specified

30. State Household Income
31. State Rent Payments
32. State AGI
33. State Exemption amount
34. State Standard Deduction
35. State Itemized Deductions
36. State Taxable Income
37. State Property Tax Credit
38. State Child Care Credit
39. State EIC
40. State Total Credits
41. State Bracket Rate

Bug Reporting

If you suspect any case has been calculated incorrectly, please extract that case (or a exemplar, if there are many cases) and run it in individual taxpayer mode. Examine the output to see if it suggests why the result is a surprise, but if you are still of the opinion that TAXSIM got it wrong, please set the case ID (variable 1) to "-1" and email the output web page to me with a statement of what you think is wrong. I will get back to you within a couple of days with an explanation or a fix. It is important that you not send large files or attachments. Just send an email with a few cases, the TAXSIM response and the reason you believe the response to be in error.

We do answer all mail, and we do follow up on queries, but it is important to abide by the guidelines in the previous paragraph. An email message with the statement that "TAXSIM is broken", or even "state x is broken for feature y" will be returned with a request for an example in Internet TAXSIM format as described above. Once we get that, we will compare our results with hand generated results done from a tax form and any problem will soon be resolved. Comments from users have led to significant improvements in the program, and are almost always resolved within 48 hours.

For more information about TAXSIM see:

Feenberg, Daniel Richard, and Elizabeth Coutts, An Introduction to the TAXSIM Model, Journal of Policy Analysis and Management vol 12 no 1, Winter 1993, pages 189-194.

This paper and this URL (https://www.nber.org/taxsim/) should be cited if any results from TAXSIM are circulated or published. If you intend to make any serious scholarly (or other) use of Internet TAXSIM you should speak with me about your project on the telephone. I am at 617-588-0343 and can offer advice etc. Don't think I am overwhelmed by calls and won't want to talk with you - I am interested in what people are doing with this tool. Sometimes I can create specialized versions for particular projects.

Daniel Feenberg
NBER
1050 Mass Ave.
Cambridge MA 02138
617-588-0343
feenberg@nber.org

Date last modified: January 2nd, 2006