Multiple income sources
in retirement

The income
layer cake

Most retirees don't have a single income source. They have 3–5 overlapping streams that start at different ages, grow at different rates, and are taxed differently. The challenge isn't generating income — it's coordinating it so you don't overpay taxes, trigger IRMAA surcharges, or create unnecessary income volatility.

Consider a married couple, both age 62, retiring today. She has a $24,000 state pension starting immediately. He plans to claim Social Security at 67 ($28,000/year). Together they have $500,000 in a traditional 401(k), $150,000 in a Roth IRA, and $100,000 in a taxable brokerage account. That's five separate income streams — each with its own start date, growth rate, and tax treatment.

Social Security
the inflation-adjusted foundation

For most retirees, Social Security is the single largest income source — and the only one that's automatically adjusted for inflation every year through cost-of-living adjustments (COLA). That makes it uniquely valuable as a hedge against rising prices over a 25–30 year retirement.

You can claim as early as 62 or as late as 70. For every year you delay past your full retirement age (67 for most people today), your benefit grows by roughly 8% per year — a guaranteed, inflation-adjusted return that's hard to match anywhere else. For a detailed breakdown of the claiming decision, see our Social Security timing guide.

The tax treatment adds complexity. Up to 85% of your Social Security benefit can be taxable, depending on your combined income (also called provisional income): half of your SS benefit plus all other taxable income. For married couples, the thresholds are $32,000 (above which up to 50% is taxable) and $44,000 (above which up to 85% is taxable). These thresholds are not inflation-indexed — they haven't changed since 1993 — which means more retirees cross them every year.

For married couples, two separate benefit streams with independent claiming ages create powerful optimization opportunities. One spouse might claim early to provide bridge income while the other delays to 70 for the maximum benefit.

Pensions and
annuities

Pensions are less common than a generation ago, but they remain significant for government employees, military retirees, teachers, and some private-sector workers. A defined-benefit pension provides a fixed monthly payment for life — predictable, but with an important caveat: many pensions have no cost-of-living adjustment.

A $24,000 pension without COLA delivers $24,000 every year in nominal terms. But after 20 years of 3% inflation, that $24,000 has the purchasing power of roughly $13,300 in today's dollars. It's the same check, but it buys 45% less. This is why pensions without COLA need to be paired with other income sources that do grow — like Social Security or a growing investment portfolio.

Pension income is taxed as ordinary income at your marginal federal rate. Every dollar of pension income increases your AGI, which can push more of your Social Security into the taxable zone and potentially trigger IRMAA Medicare surcharges.

Account withdrawals
your flexibility lever

Unlike Social Security and pensions, account withdrawals are income you control. You choose when to withdraw, how much, and from which account — and those choices are your main tool for managing taxes across retirement. For the full breakdown of withdrawal ordering, see our withdrawal order guide.

The three main account types have very different tax treatments. Taxable brokerage withdrawals are taxed at capital gains rates (0%, 15%, or 20% on gains held over a year). Traditional 401(k)/IRA withdrawals are taxed as ordinary income. Roth withdrawals are completely tax-free — and crucially, they don't count toward combined income for Social Security taxability.

That last point matters enormously when you have multiple income sources. If you need $30,000 from your accounts to supplement Social Security and a pension, pulling it from a traditional 401(k) adds $30,000 to your combined income — potentially making thousands more of your Social Security benefit taxable. Pulling the same $30,000 from a Roth adds nothing to combined income and doesn't affect your SS taxability at all.

Starting at age 73, Required Minimum Distributions (RMDs) force you to withdraw a percentage of your tax-deferred balance whether you need the money or not. Large RMDs stacked on top of Social Security and pension income can push you into higher brackets and make more of your Social Security taxable. This is why strategic withdrawals and Roth conversions before RMD age can save significant taxes.

How it all adds up
on your tax return

Each income source doesn't just add to your tax bill independently. They compound each other through the combined income calculation that determines how much of your Social Security is taxable. One extra dollar of 401(k) withdrawal can make more of your Social Security taxable, which increases your AGI, which pushes you closer to the next bracket.

Let's make this concrete. A married couple, both 64, filing jointly in 2026. She retired at 62 and claimed Social Security early ($28,000/year). He has a $24,000 state pension. They need $30,000 more from savings to cover spending. The only question: which account do they pull it from?

Same couple. Same spending. The only difference is which account the $30,000 came from.

The gap years
your planning window

The period between early retirement and when Social Security and RMDs begin is often the lowest-income window of your entire retirement. If you retire at 62 and delay Social Security to 67, you have 5 years where your only income is what you choose to withdraw — and possibly a pension.

These years are uniquely valuable for tax planning. With lower income, you can:

If you also have a pension starting at a different age than your retirement date, the coordination gets more complex. Map out how your income layers stack up year by year: which years have just pension income, which add Social Security, and when RMDs arrive. Each transition point changes your tax picture and creates different planning opportunities.

How the calculator
models this

Drawdown Arc handles all of these income sources in a single year-by-year projection with full tax detail. You enter your Social Security start age and benefit amount, pension start age and amount (with optional COLA), and balances across five account types — and the calculator shows exactly how they interact.

Each year, the projection calculates guaranteed income first (Social Security + pension), determines the remaining spending gap, then fills that gap from your accounts in priority order (default: Taxable → Crypto → Deferred → Roth). The withdrawal is then grossed up to cover federal and state taxes on the withdrawal itself — an iterative calculation that converges to the exact amount needed.

Spending phases let you model changing expenses at different ages. Maybe you spend $65,000/year until 72 when your mortgage pays off, then $50,000, then $70,000 starting at 80 when healthcare costs rise. Each phase can have its own inflation toggle. This matters for income coordination because your spending target determines how much you need to withdraw each year — which determines your tax picture.

The income chart view shows the breakdown visually: Social Security, pension, and withdrawals stacked by year, with tax detail overlaid. You can see exactly when each source kicks in, where the gaps are, and how income layers compound on your tax return. When Social Security and a pension already cover half your spending, you're only drawing down your portfolio for the other half — which means your effective withdrawal rate is much lower than it looks, and the traditional 4% rule may be more conservative than you need.

Try it
yourself

The best way to understand how your income sources interact is to model your own numbers. Enter your Social Security timing, pension details, and account balances, and see the year-by-year projection with full tax math.