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Prime Harvesting

Sequence your withdrawals across account types — taxable first, then tax-deferred, then Roth — to minimize lifetime taxes and maximize after-tax retirement income.

How It Works​

Prime Harvesting is a withdrawal sequencing strategy rather than a withdrawal rate strategy. It doesn't tell you how much to withdraw — it tells you which account to withdraw from. You still need a core spending method (4% Rule, VPW, Guardrails, etc.) to determine the total amount. Prime Harvesting then optimizes where that money comes from.

The conventional sequence is: spend taxable accounts first, then tax-deferred (Traditional IRA/401k), then Roth. The logic is that taxable accounts generate annual tax drag from dividends and capital gains whether you withdraw or not, so depleting them first stops the bleeding. Tax-deferred accounts then get more years of tax-free compounding. Roth accounts — which grow and distribute completely tax-free — are saved for last, maximizing their compounding advantage.

In practice, Prime Harvesting is more nuanced than a strict ordering. Opportunities arise to do partial Roth conversions in low-income years, harvest capital losses in taxable accounts, or strategically realize gains when you're in a low bracket. The core insight is that the sequence of withdrawals can add 10-20% more after-tax spending over a 30-year retirement compared to naive pro-rata draws from all accounts. This is one of the highest-value optimizations available in retirement planning.

The Formula​

General sequencing:

Phase 1: Draw from taxable accounts (brokerage)
  - Harvest losses when available
  - Realize gains in low-bracket years

Phase 2: Draw from tax-deferred accounts (Traditional IRA, 401k)
  - Consider partial Roth conversions in low-income years
  - Manage RMD obligations

Phase 3: Draw from Roth accounts (Roth IRA, Roth 401k)
  - Tax-free distributions
  - No RMDs (Roth IRA)

Key parameters:

  • Account balances: Taxable, tax-deferred, and Roth totals
  • Tax brackets: Current and projected federal/state rates
  • RMD schedule: Required distributions from tax-deferred accounts starting at 73
  • Roth conversion opportunities: Low-income years where conversions are tax-efficient

Pros & Cons​

Advantages:

  • Can add 10-20% more after-tax lifetime income versus naive withdrawal ordering
  • Works as a complement to any core spending method
  • Creates opportunities for tax-loss harvesting and strategic Roth conversions
  • Reduces lifetime tax burden through bracket management

Limitations:

  • US-specific tax rules — not directly applicable in other countries
  • Requires tracking multiple account types and tax lots
  • Complex to implement optimally — may benefit from professional tax planning
  • Tax laws change, which can alter the optimal sequence

Example​

Starting portfolio: $1,000,000 total | $300K taxable, $500K Traditional IRA, $200K Roth | Annual need: $60,000

Phase 1 — Ages 65-72 (Taxable first):

AgeSourceGross DrawEst. TaxAfter-Tax Income
65Taxable$60,000$4,500$55,500
68Taxable$60,000$3,800$56,200
72Taxable depleted, switch to IRA———

During Phase 1, long-term capital gains rates (often 0-15%) keep taxes low. Roth conversions of $20-30K per year can fill the remaining space in the 12% bracket.

Phase 2 — Ages 73-85 (Tax-Deferred):

AgeSourceGross DrawEst. TaxAfter-Tax Income
73Traditional IRA$60,000$7,200$52,800
80Traditional IRA$60,000$7,200$52,800

Phase 3 — Ages 86+ (Roth):

AgeSourceGross DrawEst. TaxAfter-Tax Income
86Roth IRA$60,000$0$60,000
90Roth IRA$60,000$0$60,000

The Roth provides completely tax-free income in the final phase, when healthcare expenses often peak.

When to Use This Method​

Prime Harvesting works best for retirees who:

  • Have assets spread across multiple account types (taxable, Traditional, Roth)
  • Want to maximize after-tax lifetime income
  • Are willing to do annual tax planning or work with a tax advisor
  • Are in the US tax system with access to Roth conversion opportunities

It is less suitable for retirees with all assets in a single account type, those in countries with different tax structures, or anyone who prefers a completely hands-off approach.

Try It Yourself

Compare Prime Harvesting against other strategies using your own numbers in the Scenario Builder.

References​