TSP Withdrawal Strategies: How to Draw Down Your TSP Without Overpaying Taxes

The Problem With "Just Take What You Need"

Most federal retirees approach TSP withdrawals the same way: take money when they need it, pay whatever taxes come, and don't think about it until the next withdrawal. That works — in the sense that nobody starves. But it routinely leaves tens of thousands of dollars on the table over a 20-30 year retirement.

The tax code doesn't care when you need money. It cares how much taxable income you have in a given year. A $60,000 withdrawal in a low-income year costs far less in taxes than the same withdrawal in a year when Social Security and RMDs have already filled your lower brackets.

Strategy 1: The Tax-Bracket Fill

This is the foundation for most TSP drawdown plans. The idea is straightforward: in years where your taxable income is low, voluntarily pull money from your traditional TSP (or do Roth conversions) up to the top of a target tax bracket — filling the cheap brackets before your income rises.

The prime window for federal retirees is typically between separation (when your paycheck stops) and age 62-70 (when Social Security begins). During this stretch, your taxable income might only be your FERS annuity — say $35,000-$50,000 for a career employee. The 22% bracket for single filers in 2026 runs from $49,726 to $103,350.

If your FERS annuity puts you at $45,000 in taxable income, you have roughly $58,000 of room in the 22% bracket. Pulling $58,000 from your traditional TSP or converting $58,000 to Roth at 22% is far cheaper than waiting until RMDs and Social Security push you to 24% or higher.

This strategy reduces your future traditional balance (and thus future RMDs) while locking in lower tax rates today.

Strategy 2: Roth-First vs Traditional-First Sequencing

You have both traditional and Roth money in your TSP. Which do you spend first?

Traditional first means paying taxes on the withdrawals now while letting the Roth balance continue growing tax-free. The Roth becomes your last bucket — available for large, tax-free withdrawals in late retirement when healthcare costs spike, or as a tax-free inheritance for your beneficiaries. The traditional balance shrinks faster, which means smaller RMDs later.

Roth first means tax-free income now. Your taxable income stays low, which keeps your Medicare premiums down and may keep your Social Security benefits partially untaxed. But it depletes the tax-free bucket early and leaves the traditional balance to generate larger RMDs down the road.

For most federal retirees, traditional-first (or bracket-filling from the traditional side) works better because the long-term compound benefit of tax-free Roth growth outweighs the short-term tax savings. But if you're in a year where you need to keep AGI below a specific threshold — an IRMAA cliff, an ACA subsidy threshold, or the 85% Social Security taxation trigger — Roth-first for that year might save more.

There's no universal answer. The sequencing depends on your specific income picture in each year.

Strategy 3: IRMAA-Aware Distributions

Medicare Part B and Part D premiums are based on your Modified Adjusted Gross Income (MAGI) from two years prior. Traditional TSP withdrawals increase MAGI. If a large distribution in 2026 pushes your income over an IRMAA threshold, you'll pay higher Medicare premiums in 2028.

The standard Part B premium is $202.90/month in 2026. The first IRMAA surcharge threshold for individual filers is $106,000 of MAGI. Cross it and your premium jumps to roughly $300/month — an extra $1,160 per year.

The strategy here is sizing: keep distributions sized to stay below the next IRMAA cliff, or if you must cross it, cross it decisively in one year rather than hovering near the line for multiple years.

Roth TSP withdrawals (when qualified) don't count toward MAGI. In years where you're near an IRMAA threshold, pulling from the Roth side instead of the traditional side avoids the surcharge entirely.

Strategy 4: Coordinating With Social Security Timing

When you start Social Security changes your entire drawdown calculus. Benefits claimed at 62 are permanently reduced by about 30% compared to full retirement age (67 for most current federal retirees). Delaying to 70 adds 8% per year in delayed retirement credits.

If you can cover expenses from your TSP and FERS annuity between 62 and 70, delaying Social Security means a larger guaranteed income base for the rest of your life. The TSP funds the bridge; Social Security provides the permanent floor.

This works especially well for federal retirees because their FERS annuity already provides a base income. Adding a larger Social Security benefit at 70 reduces the amount you need to pull from the TSP in later years — which means the TSP lasts longer and generates smaller taxable RMDs.

Strategy 5: The RMD Smoothing Approach

Required minimum distributions start at age 73 (born before 1960) or 75 (born 1960 or later). If you arrive at your RMD age with a $600,000 traditional TSP balance and haven't done any advance planning, your first RMD might be $22,000-$24,000 — added on top of your FERS annuity and Social Security. That combined income could push you well into the 24% bracket or trigger IRMAA.

The fix is to shrink the traditional balance before RMD age through planned withdrawals or Roth conversions in lower-income years. Every dollar you convert to Roth at 22% is a dollar that doesn't create an RMD at 24% or higher later.

Roth TSP balances are completely exempt from lifetime RMDs under SECURE 2.0. Converting traditional money to Roth moves it permanently outside the RMD calculation.

What a Good Drawdown Plan Looks Like

A functional TSP drawdown strategy isn't a single rule — it's a year-by-year plan that accounts for:

• Your FERS annuity (fixed, with modest COLA)
• Social Security timing (62 vs 67 vs 70)
• Traditional TSP balance and projected RMDs
• Roth TSP balance and 5-year clock status
• Tax brackets you'll occupy in each year
• IRMAA thresholds for Medicare premiums
• The FERS Special Retirement Supplement and its earnings test (TSP withdrawals don't count as earned income)

This doesn't require a financial advisor — it requires a spreadsheet and the discipline to look ahead rather than just reacting to this quarter's bills.

The Complete Drawdown Playbook

The TSP Withdrawal & Drawdown Strategy Guide covers the full post-separation withdrawal process — from settling loans and navigating spousal consent through building a tax-efficient distribution sequence across your traditional and Roth balances, coordinated with your FERS annuity and Social Security timing.

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