A Side Job May Help a 66-Year-Old Pay Bills Now but Increase Her Medicare Costs Later

A freelance bookkeeping gig can ease a retiree’s money worries in the present while quietly creating a Medicare surcharge that may not show up until two years later. Knowing when extra earnings start to affect Medicare can change the way someone approaches that work.

Recent survey data suggest the issue is already affecting older workers. A WTW survey found that 21% of employees age 60 and older delayed or skipped medical care because of cost. Consider a hypothetical 66-year-old widow who begins freelance bookkeeping to help cover dental work and rising prescription costs. The extra income solves a short-term budget problem, but it could also push her Medicare premiums higher later.

Most people with side jobs never reach that point. CMS says income-related Medicare surcharges affect about 8% of people enrolled in Part B. For a single filer, there is no surcharge if modified adjusted gross income, or MAGI, is $109,000 or less; for joint filers, the cutoff is $218,000. Households well below those levels owe nothing extra because of side-job income. The risk is concentrated among people already near the threshold, and widows can be especially vulnerable after switching to single filing status.

All Side Income Counts in Medicare’s Income Formula

The surcharge is known as IRMAA, and it is based on MAGI. That figure includes adjusted gross income plus tax-exempt interest, so even municipal bond income can matter. Wages are counted in AGI, while freelance earnings are usually included after business expenses and the deduction for half of self-employment tax. Medicare does not separate earnings used for medical expenses from earnings used for anything else.

Widowhood can make the picture more complicated. If a spouse has died in an earlier tax year and the survivor no longer qualifies for joint or surviving-spouse filing status, she may face the lower single-filer threshold instead. In this example, that means a limit of $109,000 rather than $218,000. Even if most retirement income stays the same, there is less room before income-related Medicare charges begin.

A $20,000 Bookkeeping Side Job Could Add $1,148 to Medicare Costs

Because Medicare uses a two-year lookback, a tax return from one year affects premiums two years later. CMS has not yet announced the brackets for that later year, so the example below uses the current thresholds for illustration.

Suppose her pension, IRA withdrawals and taxable Social Security benefits already put her MAGI at $95,000. That leaves her $14,000 below the single-filer threshold. If bookkeeping income adds another $20,000 after expenses and deductions, her MAGI rises to $115,000, which puts her $6,000 over the line.

Under the threshold, she pays the standard Part B premium of $202.90 per month, plus whatever her Part D plan charges. Using the current brackets as a guide, crossing $109,000 would lift her monthly Part B premium to $284.10 and add $14.50 for Part D, which equals $1,148.40 in extra annual premiums. Her actual future premiums will depend on income limits and surcharge amounts that have not yet been released.

The Medicare surcharge is separate from any income taxes owed on bookkeeping profits. Social Security reviews income every year, so a one-time increase does not automatically mean permanently higher premiums. If her income drops in a later year, she could move back to standard premiums two years afterward. IRMAA is only one of several Medicare charges that can quietly affect retirement income.

SSA-44 Relief Depends on a Qualifying Event

Social Security allows Medicare beneficiaries to ask for a lower IRMAA after certain life-changing events that reduce income. Qualifying events include marriage, divorce, the death of a spouse, stopping or reducing work, loss of income-producing property, some pension changes and certain employer settlement payments.

If she shuts down the bookkeeping business and her income falls in a later year, she may be able to request a recalculation of premiums using more recent income information. That is done through Form SSA-44. A profitable year by itself does not qualify, and neither does a voluntary IRA withdrawal on its own.

Steps to Consider Before Year-End

1. Estimate MAGI now. Add expected AGI and tax-exempt interest. If income is getting close to the single-filer or joint-filer threshold, review any other income you expect before year-end. The later-year brackets are not yet available, but knowing where you stand can help prevent a surprise premium jump.
2. Think about retirement contributions. Freelance earnings may make it possible to contribute to a SEP-IRA or traditional IRA, depending on the rules and limits that apply. Deductible contributions can reduce AGI and may help avoid a higher Medicare bracket. But a $20,000 profit does not allow an unlimited SEP contribution, and eligibility for a deductible traditional IRA contribution depends on individual circumstances.
3. Weigh the full tradeoff. After taxes, self-employment tax and a possible Medicare surcharge, the bookkeeping income may still leave her better off. Skipping needed medical care just to avoid higher premiums is not the solution.

She can continue earning, watch her income carefully and revisit IRMAA relief if she eventually stops working.