TSP Loan Calculator

2026 rules

Work out your biweekly payment on a TSP loan and what it costs you in lost growth.

Your numbers

Loan amount

Loan type

Repayment period (years)

Interest rate (the G Fund rate when you apply)

Your own contributions and earnings in the TSP

Return you'd expect on the money if left invested

Result

Payment each biweekly paycheck$171.93

Loan amount$20,000
Payments130 biweekly over 5 years
Interest you pay (back into your account)$2,352
Loan fee$50
Growth you may give up vs staying invested$1,841

Leaving federal service makes the balance due. Anything not repaid becomes a taxable distribution, plus 10% if you are under 59½ (55 if you separated that year or later).

How it works

You can borrow $1,000 to $50,000 from your own contributions and earnings. General-purpose loans run one to five years, residential loans up to fifteen. The rate is the G Fund rate when you apply, and there is a $50 fee.

Interest goes back into your account, but the borrowed money earns only that rate instead of what your funds return.

2026 figures: OPM FERS computation; TSP loans; IRS Notice 2025-67 (2026 retirement plan limits).

Questions

What happens if I leave federal service with a loan?

You must repay the balance, or it becomes a taxable distribution, plus 10% if you're under 59½ and the separation exception doesn't apply.

Can I have two loans?

You can have one general-purpose loan and one residential loan at the same time.