Federal Comp Time vs. Overtime Value Calculator

Introduction: evaluating federal compensatory time against overtime pay

Federal General Schedule employees may be offered a choice between overtime cash and compensatory time off when workloads require extra hours. The two choices solve different problems. Overtime increases current take-home pay, while comp time creates a future block of leave that may be especially useful after a deadline, during a family need, or when regular leave is scarce. A meaningful comparison must look beyond the headline number of hours. The overtime rate can be limited by the GS-10 step 1 ceiling, cash is reduced by the employee's marginal tax assumption, and banked leave may not be available on the desired date. This calculator brings those factors into one side-by-side estimate.

The federal comp-time decision is personal even when the same overtime assignment is offered to several employees. Someone paying down a high-interest balance may put greater weight on immediate net cash. Someone facing a demanding travel period, exam preparation, caregiving, or a sustained surge may reasonably place a higher dollar value on an hour away from work. The form therefore asks for a personal value for leave rather than pretending every employee values a free hour exactly like an hour of pay. It also allows for a planned delay, a risk that the leave will not be used, and a discount rate that expresses the preference for value today rather than later.

Federal overtime and comp-time formulas used in this comparison

This federal overtime comparison starts by converting annual locality-adjusted basic pay to an hourly rate using 2,087 hours. If annual basic pay is S and the locality-adjusted GS-10 step 1 annual rate is C, the hourly overtime rate is the employee's basic hourly rate or, if higher, the lower of one-and-one-half times the employee hourly rate and one-and-one-half times the GS-10 step 1 hourly rate:

.

The calculator multiplies that rate by the proposed overtime hours to obtain gross overtime, then reduces the result by the marginal tax percentage entered in the form. It separately converts overtime hours into comp hours using the selected comp-time accrual rate. For planned use of comp time, the calculation begins with the employee's own hourly leave valuation; when that field is blank, it uses the basic hourly rate instead. The forfeiture percentage reduces the expected usable hours. Finally, a weekly delay is converted to a fraction of a year and discounted using the personal annual discount rate.

The present value $V_{\mathrm{CT}}$ of using comp time after $w$ weeks is expressed as

, where $H_{\mathrm{ct}}$ represents accrued comp hours, $V_{\mathrm{hour}}$ is the personal value per hour of leave, $p_{\mathrm{forfeit}}$ is the probability of forfeiture, and $r_{\mathrm{disc}}$ is the annual discount rate.

The final comparison also shows a delayed payout scenario. It treats the accrued comp hours as a payment at the calculated overtime rate, reduces that payment by the tax assumption, and discounts it back from the payout week selected. This is not a prediction of an agency's payment obligation. Comp-time expiration, payout treatment, employee coverage, and timing can depend on applicable law, agency policy, and negotiated agreements. The scenario is useful as a fallback comparison when planned leave may not be taken before the selected threshold. The break-even value reported by the calculator is simply net overtime cash divided by accrued comp hours: it is the value per comp hour needed to match taking the overtime money now.

Worked example: comparing cash and recovery time after a federal workload surge

Consider the values prefilled in the federal comp-time form: annual basic pay of $98,000, a locality-adjusted GS-10 step 1 rate of $84,000, and ten proposed overtime hours. The employee expects one comp hour for each overtime hour, plans to use leave in eight weeks, estimates a 10 percent chance that the hours will not be used, applies a 30 percent marginal tax rate, and uses a 3 percent annual discount rate. The employee also enters a personal leave value of $45 per hour.

Annual pay of $98,000 produces a basic hourly rate of about $46.96. One-and-one-half times that amount is about $70.43 per overtime hour. One-and-one-half times the GS-10 step 1 hourly figure is about $60.37, so the GS-10 ceiling applies while remaining above the employee's basic hourly rate. Ten overtime hours therefore produce about $603.74 in gross overtime and about $422.62 after the 30 percent tax assumption. The comp-time alternative creates ten hours, but the 10 percent forfeiture assumption means the comparison values nine expected usable hours. At $45 per hour and discounted for eight weeks, those hours have a present value of about $403.16.

Under the same inputs, a payout delayed for 52 weeks has an estimated after-tax present value of about $410.31. The example does not establish which option an employee should choose: it shows the assumptions that drive the result. Raising the personal value of leave increases the planned-use value directly. Increasing the forfeiture risk reduces it directly. A longer wait or a higher discount rate also lowers the present value of future leave or a future payment. The break-even leave value is about $42.26 per accrued comp hour, so a person who genuinely values an hour off above that amount would favor the planned-use comparison before considering nonfinancial benefits.

Comparing federal overtime choices across employee circumstances

Federal overtime choices can differ sharply even for employees who work the same number of extra hours. The comparison table is best read as a map of the assumptions that matter rather than as a pay chart for any grade, locality, or agency.

For example, an employee preparing for a professional examination may reasonably value a scheduled day away from work more highly than its equivalent in immediate net pay. An employee facing relocation costs or a short-term financial obligation may instead prefer cash even if time off would be pleasant later. In a unit where operational demands make leave scheduling unpredictable, the forfeiture input deserves particularly careful thought. The calculator does not assign those priorities for the user; it makes their financial implications visible.

Federal comp-time comparison limitations and policy assumptions

This federal comp-time versus overtime estimate is not a substitute for agency timekeeping guidance, payroll advice, a collective bargaining agreement, or an HR determination. Overtime eligibility, the availability of compensatory time, accrual rates, expiration rules, and payout treatment can vary with FLSA status, appointment, agency policy, and negotiated terms. Travel compensatory time and other premium-pay arrangements may follow different rules. The calculator uses the annual rates and assumptions supplied by the user; it does not determine an employee's correct locality rate, pay step, entitlement, or authorization.

The tax result is also a simplified marginal-rate estimate. It does not model withholding methods, filing status, deductions, tax brackets, Social Security wage bases, retirement contributions, Thrift Savings Plan elections, or other payroll effects. Similarly, a personal value for time off is necessarily subjective. Before accepting or declining an arrangement, check the relevant agency policy and confirm the applicable terms with a supervisor, payroll office, HR office, or representative as appropriate. Use the calculator to test the comp-time assumptions most likely to change your decision rather than treating one displayed amount as a binding answer.

How to use this federal comp time versus overtime calculator

1. Enter your Annual rate of basic pay including locality (USD) and the applicable Locality-adjusted GS-10 Step 1 annual rate for overtime cap (USD).
2. Enter the Proposed overtime hours this pay period, the comp hours earned per overtime hour, and when you expect to use any banked leave.
3. Set the expected payout timing, forfeiture risk, marginal tax rate, discount rate, and—if desired—your personal dollar value for an hour of leave.
4. Compare the after-tax overtime result with planned comp-time use and the delayed payout scenario, then review the assumptions most likely to affect your federal overtime decision.