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IRS.gov Website
Publication 571
taxmap/pubs/p571-024.htm#en_us_publink1000239773

Chapter 9
Worksheets(p16)

Chapter 2 introduced you to the term maximum amount contributable (MAC). Generally, your MAC is the lesser of your:
The worksheets in this chapter can help you figure the cost of incidental life insurance, your includible compensation, your limit on annual additions, your limit on elective deferrals, your limit on catch-up contributions, and your MAC.
Pencil
After completing the worksheets, you should maintain them with your 403(b) records for that year. Do not attach them to your tax return. At the end of the year or the beginning of the next year, you should compare your estimated compensation figures with your actual figures.
If your compensation is the same as, or more than, the projected amounts and the calculations are correct, then you should simply file these worksheets with your other tax records for the year.
If your compensation was lower than your estimated figures, you will need to check the amount contributed during the year to determine if contributions are more than your MAC.
taxmap/pubs/p571-024.htm#en_us_publink1000239775

When Should I Figure MAC?(p16)

rule
At the beginning of each year, you should figure your MAC using a conservative estimate of your compensation. Should your income change during the year, you should refigure your MAC based on a revised conservative estimate. By doing this, you will be able to determine if contributions to your 403(b) account should be increased or decreased for the year.
taxmap/pubs/p571-024.htm#en_us_publink1000239777

Checking the Previous Year's Contributions(p16)

rule
At the beginning of the following year, you should refigure your MAC based on your actual earned income.
At the end of the current year or the beginning of the next year, you should check your contributions to be sure you did not exceed your MAC. This means refiguring your limit based on your actual compensation figures for the year. This will allow you to determine if the amount contributed is more than the allowable amounts, and possibly avoid additional taxes.
taxmap/pubs/p571-024.htm#en_us_publink1000239778

Available Worksheets(p16)

rule
The following worksheets have been provided to help you figure your MAC.
taxmap/pubs/p571-024.htm#en_us_publink10004191

Worksheet A. Cost of Incidental Life Insurance

Note. Use this worksheet to figure the cost of incidental life insurance included in your annuity contract. This amount will be used to figure includible compensation for your most recent year of service.

1.Enter the value of the contract (amount payable upon your death)1.
2.Enter the cash value in the contract at the end of the year2.
3.Subtract line 2 from line 1. This is the value of your current life insurance protection3.
4.Enter your age on your birthday nearest the beginning of the policy year4.
5.Enter the 1-year term premium for $1,000 of life insurance based on your age. (From Figure 3-1) 5.
6.Divide line 3 by $1,0006.
7.Multiply line 6 by line 5. This is the cost of your incidental life insurance7.
taxmap/pubs/p571-024.htm#en_us_publink10004192

Worksheet B. Includible Compensation for Your Most Recent Year of Service1

Note. Use this worksheet to figure includible compensation for your most recent year of service.

1.Enter your includible wages from the employer maintaining your 403(b) account for your most recent year of service 1.
2.Enter elective deferrals excluded from your gross income for your most recent year of service2 2.
3.Enter amounts contributed or deferred by your employer under a cafeteria plan for your most recent year of service 3.
4.Enter amounts contributed or deferred by your employer according to your election to your 457 account (a nonqualified plan of a state or local government or of a tax-exempt organization) for your most recent year of service 4.
5.Enter pre-tax contributions (employer's contributions made on your behalf according to your election) to a qualified transportation fringe benefit plan for your most recent year of service 5.
6.Enter your foreign earned income exclusion for your most recent year of service 6.
7.Add lines 1, 2, 3, 4, 5, and 6 7.
8.Enter the cost of incidental life insurance that is part of your annuity contract for your most recent year of service 8.
9.Enter compensation that was both:
  • Earned during your most recent year of service, and
  • Earned while your employer was not qualified to maintain a 403(b) plan
9.
10.Add lines 8 and 910.
11.Subtract line 10 from line 7. This is your includible compensation for your most recent year of service11.
1Use estimated amounts if figuring includible compensation before the end of the year.
2Elective deferrals made to a designated Roth account are not excluded from your gross income and should not be included on this line.
taxmap/pubs/p571-024.htm#en_us_publink10004193

Worksheet C. Limit on Catch-Up Contributions

Note. If you will be age 50 or older by the end of the year, use this worksheet to figure your limit on catch-up contributions.

1.Maximum catch-up contributions1.$5,500
2.Enter your includible compensation for your most recent year of service 2.
3.Enter your elective deferrals3.
4.Subtract line 3 from line 24.
5.Enter the lesser of line 1 or line 4. This is your limit on catch-up contributions5.

Worksheet 1. Maximum Amount Contributable (MAC)

Note. Use this worksheet to figure your MAC.
Part I. Limit on Annual Additions  
1.Enter your includible compensation for your most recent year of service 1.
2.Maximum1:
  • For 2013, enter $51,000
  • For 2014, enter $52,000
2.
3.Enter the lesser of line 1 or line 2. This is your limit on annual additions 3.
 Caution: If you had only nonelective contributions, skip Part II and enter the amount from line 3 on line 18.   
Part II. Limit on Elective Deferrals  
4.Maximum contribution:
  • For 2013, enter $17,500
  • For 2014, enter $17,500
4.
 Note. If you have at least 15 years of service with a qualifying organization, complete lines 5 through 17. If not, enter zero (-0-) on line 16 and go to line 17.   
5.Amount per year of service 5.$ 5,000
6.Enter your years of service 6.
7.Multiply line 5 by line 6 7.
8.Enter the total of all elective deferrals made for you by the qualifying organization for prior years 8.
9. Subtract line 8 from line 7. If zero or less, enter zero (-0-) 9.
10.Maximum increase in limit for long service10.$15,000
11. Enter the total of additional pre-tax elective deferrals made in prior years under the 15-year rule11.
12.Enter the aggregate amount of all designated Roth contributions permitted for prior years under the 15-year rule12.
13.Add line 11 and line 1213.
14. Subtract line 13 from line 1014.
15. Maximum additional contributions15.$ 3,000
16.Enter the least of lines 9, 14, or 15. This is your increase in the limit for long service16.
17.Add lines 4 and 16. This is your limit on elective deferrals17.
 Part III. Maximum Amount Contributable  
18.
  • If you had only nonelective contributions, enter the amount from line 3. This is your MAC.

  • If you had only elective deferrals, enter the lesser of lines 3 or 17. This is your MAC.

  • If you had both elective deferrals and nonelective contributions, enter the amount from line 3. This is your MAC. (Use the amount on line 17 to determine if you have excess elective deferrals as explained in chapter 7.)
18.
1If you participate in a 403(b) plan and a qualified plan, you must combine contributions made to your 403(b) account with contributions to a qualified plan and simplified employee pension plans of all corporations, partnerships, and sole proprietorships in which you have more than 50% control. You must also combine the contributions made to all 403(b) accounts on your behalf by your employer.