For most retirees, DIY investor retirement mistakes cost more in withdrawal timing than fund selection, as Ritholtz Wealth Management sees when paychecks stop. Subtract predictable income from annual spending, then divide what remains by 12 before choosing an account to sell.
Watch that monthly gap above any other figure, because it moves with pension income, rent, Social Security, taxes, and whichever account supplies the next dollar. Ritholtz Wealth Management wrote this for engineers and analytically minded do-it-yourself investors who have built their own portfolios and now need those holdings to produce a paycheck.
By Marcus Thompson, CFA — Wealth Manager | Reviewed by Hiroshi Tanaka, CFPMarcus builds diversified portfolios for high-net-worth clients, with deep expertise in asset allocation and risk management.
DIY investor retirement mistakes: “I can spend the Roth first and sort out the rest later”
A Roth withdrawal can be tax-free, but spending it first is often an expensive convenience. For a Roth IRA, the IRS generally requires both age 59½ and a five-year holding period for a qualified distribution. Taking Roth dollars early may preserve taxable lots, yet it also uses the account with the most valuable future tax treatment before you compare the alternatives.
Start with the monthly gap. Use cash already set aside for near-term spending, then compare the gain from taxable shares, the ordinary income from a traditional IRA, and the value of leaving Roth money alone. A $6,000 monthly gap is not a command to sell $72K of whichever account feels simplest.
Ritholtz Wealth Management treats account order as a cash-flow decision, not a permanent ranking of accounts. A Roth withdrawal may still make sense in a low-income year, for a large one-time expense, or when it avoids a larger problem elsewhere. But “tax-free” does not automatically mean “first.”
- Five-year clock: confirm the Roth IRA holding period before calling a withdrawal qualified.
- Monthly gap: list income and spending before deciding which account funds the shortfall.
- Account order: compare gains, ordinary income, and future Roth value for each sale.
“I should raise five years of cash all at once”
Selling a five-year cash reserve in one taxable transaction can turn a $90K gain plus $24K of rental income into $114K of 2024 MAGI. For a single Medicare beneficiary, that adds $974.40 of Part B premium in 2026, two years after the sale. The sale feels prudent because cash is visible and stocks are not, but the bill arrives on the 2026 premium notice, long after the 2024 trade is forgotten.
For illustration, Olga is age 64 in 2024, a widowed retired software architect with a paid-off house and a three-fund portfolio she managed for 25 years. She has $2.3M, inherited rental income of $24K a year, and an $80K annual spending target. Her portfolio needs to provide $56K a year because $80K minus $24K equals $56K. Over five years, $56K × 5 = $280K, exactly matching the cash-and-short-term-Treasury allocation she already holds.
If Olga sells $280K of taxable shares at once and the sale creates a $90K gain, her 2024 MAGI is $24K of rent plus $90K of gain, or $114K. Medicare uses 2024 MAGI to set 2026 premiums. That total exceeds the $109K single threshold by $5K, putting her in a higher 2026 Part B tier. The annual difference is $81.20 a month × 12 months = $974.40.
Olga already has the reserve she thought she needed to create. She can earmark it for five years and sell taxable shares in smaller planned lots later if her cash need calls for them. The calculator on this site can help test a withdrawal amount, gain, and premium change before a sale. Investments can decline, including the money you originally put in, so a reserve reduces forced sales but cannot erase market risk.
Look at the taxable-sale row. Selling $56K of lots with an $18K gain keeps Olga's 2024 MAGI at $42K, well under the $109K single threshold, and her Roth balance stays untouched. The table doesn't pick a row for her. It shows that the $56K of cash and the gain behind it are two separate numbers, and only the gain shows up in MAGI.
The sale that changes a later premium
Keep the reserve you already built
For a person beginning Medicare in 2026, if a planned 2024 taxable sale would push MAGI above $109K single or $218K joint, spread the sale when cash needs permit and compare the two-year Medicare cost first.
| Year-one source | Cash raised | 2024 MAGI | What it preserves |
|---|---|---|---|
| $56K Roth withdrawal | $56K | $24K | Taxable lots |
| Taxable sale, $18K gain | $56K | $42K | Roth balance |
| $56K traditional IRA | $56K | $80K | Roth and taxable basis |
“The brokerage statement tells me what I can spend”
A taxable account balance is not spendable cash until you check cost basis, unrealized gain, and the tax lots that will actually be sold. Obtain cost-basis paperwork from the custodian before placing a sale, especially for old transferred holdings or reinvested distributions. Selling without choosing lots can realize a larger gain than the cash need requires, and the IRS may require that sale on Form 8949. That is a paperwork problem with a tax consequence.
What replaces a paycheck each month after DIY investor retirement mistakes?
Retirement income works best when you write it as a monthly payroll replacement: pension, rental income, Social Security when it starts, and portfolio withdrawals each get their own line. Olga’s $80K annual spending target equals about $6,667 a month before separating income sources. The portfolio should fill the remaining gap, not carry the whole target by habit.
A pension or rental check usually arrives on a schedule. Portfolio money does not, which is why a retiree needs a calendar for transfers and a reserve for bills. If Olga receives $2,000 a month of rental income, her remaining monthly gap is about $4,667 before taxes and other income. That number tells her how much cash needs to be available, not how much stock must be sold today.
Holding more near-term cash can prevent a stock sale during a bad market. Holding too much for too long gives up expected growth and can make inflation harder to absorb. Ritholtz Wealth Management would rather see a stated spending reserve than a vague pile of cash that slowly becomes an accidental investment policy.
A retirement income planning review can put the income dates and account withdrawals on one calendar. It does not solve an immediate large expense, a long-term care need, or a concentrated stock position. Those may call for a different cash source and separate tax or legal advice.
Put each income source on its own line
- Predictable income: enter net pension, rent, and Social Security by month.
- Portfolio gap: transfer only the remaining monthly amount from the planned source.
How much can one taxable sale change Medicare costs?
For 2026, Medicare uses 2024 MAGI to set premiums; the standard Part B premium is $202.90 a month for single MAGI up to $109K and joint MAGI up to $218K. A single filer with 2024 MAGI from $109K through $137K pays $284.10 a month, which is $81.20 more each month.
An extra $974.40 a year looks small beside a $2.3M portfolio, until it is one of several avoidable leaks. Test a planned sale against the MAGI of the year Medicare will look back to before you sell. Medicare resets its thresholds and premiums each year, so pull the current figures when the sale is actually on the calendar.
The IRS definition of MAGI is not simply the cash that landed in your checking account. Rental income, capital gains, IRA distributions, and other income can matter. Ritholtz Wealth Management compares the gain created by each tax lot with the cash needed, then asks whether the sale lands in a Medicare lookback year.
What can you change after the first withdrawal?
You can usually change next year’s withdrawal amount or select different tax lots before a sale settles, but a realized gain, a completed Roth withdrawal, and a missed chance to build cash before a downturn do not rewind. At age 73, required minimum distributions begin for many retirees; they begin at age 75 for people born in 1960 or later. The IRS sets those dates, and required distributions can narrow your choices later.
Olga can use her $24K of rental income and her existing near-term reserve. Ramon and Yolanda should not copy her sequence just because all three households own funds. Their small state pension, several account types, and each spouse’s future Social Security claiming date create a different monthly gap and a different tax picture.
A married household uses joint IRMAA thresholds and often has two sets of account types. A surviving spouse may later face the single threshold with less income flexibility. An early retiree also needs to watch age-based withdrawal restrictions before treating a retirement account as the first source of spending.
Ritholtz Wealth Management favors a written withdrawal order that gets checked every year over a rigid formula. Markets move, spending shifts, and tax paperwork changes. We revisit the order each January, while next year's sale is still only a plan.
Some choices remain flexible
Two households, different withdrawal orders
- Before selling: check the lookback-year MAGI and the specific tax lots.
- Before age 73: map traditional IRA withdrawals against future RMDs.
- For couples: run the monthly gap under joint and survivor income.
Your questions about DIY investor retirement mistakes, answered
Should my adult child know which account I use for monthly retirement withdrawals?
Yes, an adult child who may help during an illness or emergency should know where the monthly cash comes from and where the paperwork is kept. They do not need trading authority to understand the system. Leave a short list of accounts, recurring income, the planned cash reserve, and the professional contacts involved.
Can I take Roth withdrawals first if I am already age 59½?
Yes, if the Roth IRA also meets the five-year holding requirement for qualified withdrawals. That does not make Roth-first spending the automatic choice. Compare your taxable account’s gain, traditional IRA income, Medicare lookback year, and the value of retaining Roth dollars for later spending or heirs.
What happens if a taxable sale raises my income before Medicare starts?
A taxable sale before Medicare begins can still affect a later premium because Medicare uses income from two years earlier. For 2026 premiums, Medicare uses 2024 MAGI. Check the lookback year before selling, then compare a one-time sale with smaller sales spread across years if your cash reserve permits.
How should a married couple divide withdrawals when one spouse has a pension?
Start with the pension as predictable household income, then calculate the monthly gap for both spouses together. Compare which spouse’s account creates taxable income or capital gains and test joint Medicare thresholds. Also run a survivor version, since the household may later move from joint thresholds to single thresholds.
Can I rebuild my cash reserve after I have already retired?
Yes, a retiree can rebuild cash gradually from planned withdrawals, income above spending, or scheduled sales in stronger markets. Avoid rebuilding the entire reserve through one large taxable sale without checking cost basis and Medicare timing. The target reserve should match your spending gap and the reliability of your other income.
What Ritholtz Wealth Management checks before a retirement withdrawal
Ritholtz Wealth Management would first map the next 12 months of spending against predictable income, then list account type, cost basis, and the gain or ordinary income created by each possible withdrawal. The review would also flag a Medicare lookback year, a Roth qualification issue, or a future RMD before suggesting a fund change.
The account that feels easiest to sell is not always the cheapest paycheck source.
Sources
This article provides general information only and is not individualized investment, tax or legal advice. Investing involves risk, including the possible loss of principal. Talk to a qualified professional about your specific situation before making any financial moves.