Don McDonald Reveals the Cash Flow Question That Retirees Must Answer First

On a recent episode of Talking Real Money, a caller named Michael from Vancouver, Washington asked the hosts something most retirement articles skip past: what actually goes into building a financial plan. Co-host Don McDonald answered with a single question that does more work than any spreadsheet template: “How am I going to replace the money that’s coming in and maintain my lifestyle for the next 20 or 30 years? That’s what planning really is.”

If you cannot answer that question with specific dollar figures, every other piece of the plan, from Social Security timing to portfolio allocation, is guesswork. The stakes are concrete. Underestimate the number and you run out of money in your 80s. Overestimate it and you work years longer than necessary, or you live too cheaply while you are still healthy enough to enjoy spending.

The Verdict: McDonald Is Right, and the Math Proves It

McDonald’s framing is correct because retirement planning is fundamentally a cash-flow replacement problem. A $2 million portfolio means nothing in isolation. What matters is whether the income it generates, combined with Social Security and any pensions, covers your actual annual spending after inflation, every year, for as long as you live.

Walk through a realistic example. Say you and a spouse spend $80,000 a year in today’s dollars and plan to retire at 65. Social Security replaces some of that. Per Bureau of Economic Analysis data, total Social Security transfer receipts ran at $1,631.2 billion in the first quarter of 2026, and per capita disposable income reached $68,617. For a typical two-earner couple, combined Social Security might cover $45,000 of that $80,000 budget. The gap is $35,000 a year, and that gap is what your portfolio has to produce.

Using the 4% rule McDonald referenced, generating $35,000 of annual withdrawals requires roughly $875,000 invested. Using a more conservative 3.5% rule, you need $1,000,000. That is the bottom-line number Michael was missing: a target tied to a real income gap.

Now layer inflation on top. The Consumer Price Index hit 332.4 in April 2026, up from 320.6 a year earlier. That $80,000 budget today becomes a much larger nominal number 20 years into retirement. Social Security adjusts for inflation. A fixed pension typically does not. The portion of your spending that has to come from your portfolio is the portion that must grow with prices, which is why income planning and withdrawal strategy cannot be separated.

The Variable That Flips the Answer

The single factor that most changes McDonald’s math is how much of your retirement income comes from inflation-adjusted sources versus fixed ones. If 80% of your spending is covered by Social Security and an inflation-linked pension, a modest portfolio works fine. If only 40% is covered, the portfolio has to do far more heavy lifting, and current yields matter a great deal.

The 10-year Treasury sits at almost 5%, near the top of its 12-month range, while the federal funds rate is about 4% after 75 basis points of cuts since September 2025. Higher bond yields make the income side of a portfolio easier. Lower yields squeeze retirees who depend on fixed-income returns. Two retirees with identical $1 million portfolios can face very different outcomes depending on the yield environment when they start drawing down.

Build the Plan in This Order

McDonald suggested starting with expenses, and he is right. “If I was writing a plan, the first thing I would be looking at probably would be what expenses am I going to have in retirement? How much income do I really need?” Work the checklist in this sequence:

1. Map your retirement spending. List every monthly expense you expect at 65, then again at 75 and 85. Healthcare rises. Travel often falls. Mortgage may end.
2. Inventory fixed income sources. Pull your Social Security estimate from SSA.gov for claiming ages 62, 67, and 70. Add any pensions and annuities. This is your income floor.
3. Calculate the gap. Subtract fixed income from expected spending. Multiply the annual gap by 25 for a 4% withdrawal target, or by 28 to 30 for a more conservative draw.
4. Stress-test for inflation. The personal savings rate fell to 4% in the first quarter of 2026, down from 6.2% two years earlier. Build inflation assumptions into the spreadsheet McDonald recommended.
5. Layer the rest. Estate documents, Medicare elections at 65, life and umbrella insurance, and a written answer to “What am I going to do with my time?”

The plan is the answer to McDonald’s question, written down in dollars.