TSP Loan Calculator
Borrowing from the Thrift Savings Plan uses amortizing payroll payments — enter vested balance, loan amount, rate, and term. Click any i for detail.
TSP loan
Vested balance ($)
i
Vested balance
TSP balance available for loan-limit sketches. |
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|---|---|
Loan amount ($)
i
Loan amount
Principal of the TSP loan. |
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Interest rate (%)
i
Rate
TSP loan interest rate (often tied to the G Fund). |
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Term (years)
i
Term
Repayment period (general-purpose loans often ≤5 years). |
How to use this calculator
- Enter vested TSP balance and loan amount.
- Set rate and term.
- Review payroll payment and interest returning to your account.
Results explained
Headline is the payroll payment. Interest is paid to your TSP, but money out of the market can still mean opportunity cost.
Quick reference: TSP loans
Plan rules change — verify on tsp.gov.
| Item | Detail |
|---|---|
| Payment | Amortizing PMT |
| Interest | Paid to your TSP |
| Common cap | ~50% of vested balance |
Residential loans can allow longer terms than general-purpose loans.
How the estimate is built
Standard amortizing payment on loan amount, rate, and term in months (same math as a 401(k) plan loan sketch).
Example scenario
$20,000 for 5 years at 4.5% → roughly mid-$300s per month with a few thousand in interest repaid to yourself.
FAQ
What if I leave federal service?
Outstanding TSP loans may need quick repayment or become taxable — confirm current rules.
Is interest double-taxed?
Repayments use after-tax dollars; compare carefully to other borrowing.
General vs residential?
This page is a payment sketch — term caps differ by loan type.