Why a $1.4 Million 401(k) Makes That Side Hustle Far More Expensive Than You Think

1 day ago 3

Marc Guberti

Thu, June 11, 2026 astatine 10:24 AM CDT 5 min read

Quick Read

A $25,000 part-time consulting gig tin propulsion a retired couple's MAGI implicit $218,000, triggering $2,297 successful yearly Medicare IRMAA surcharges.
After 22% national taxes and IRMAA surcharges, a $25,000 consulting occupation nets the mates lone astir $17,200 earlier authorities taxes.
Retirees tin debar crossing the IRMAA cliff by cutting 401(k) withdrawals dollar-for-dollar to offset consulting income, keeping MAGI flat.
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A scholar connected the Bogleheads forum laid retired a acquainted setup past month: 67 years old, spouse the aforesaid age, $1.4 cardinal divided crossed 2 accepted 401(k)s, Social Security flowing, and a consulting connection connected the array for 20 hours a week astatine $25,000 a year. The existent question was what it would really cost.

A elder antheral with achromatic hairsbreadth and a beard, wearing a airy grey collared shirt, sits astatine a desk. He holds a achromatic insubstantial successful his near manus and a pen successful his right, looking intently astatine the papers with a superior expression. A metallic laptop is partially disposable connected the table to his left, and blurred bookshelves with books and potted plants are successful the background.

For astir couples successful this band, the reply is hiding successful a spot they seldom look: the IRMAA tables that govern Medicare Part B and Part D premiums. A part-time occupation that feels similar recovered wealth tin softly trigger $2,297 successful other Medicare premiums per twelvemonth for the couple. Worse, the measure does not amusement up until 2 years later.

The income stack that creates the occupation

Picture the mates earlier the consulting gig. They propulsion astir $60,000 from the 401(k)s. They cod a combined $55,000 successful Social Security, of which 85%, oregon astir $47,000, is taxable. Add a spot of dividend income from a taxable brokerage account, and their modified adjusted gross income lands adjacent $200,000. That sits comfortably nether the $218,000 associated threshold wherever IRMAA kicks successful for 2026.

Now driblet a $25,000 consulting cheque connected top. MAGI jumps to astir $225,000. That pushes them implicit the associated cliff into the archetypal IRMAA bracket, which runs from $218,000 to $274,000 successful MAGI.

What the IRMAA tier really costs

In the archetypal IRMAA tier, each spouse connected Medicare pays a Part B surcharge of $81.20 per period connected apical of the modular $202.90 premium. Each spouse besides pays a Part D surcharge of $14.50 per month.

Two people. $95.70 per idiosyncratic per period successful surcharges. Multiply by 12 months and the household pays $2,297 successful other Medicare premiums it would not different owe. The marginal taxation mathematics is brutal erstwhile you stack it: the consulting income gets deed with national taxation successful the 22% bracket, which unsocial is $5,500. Add the IRMAA measure and the effectual outgo approaches $7,800, leaving astir $17,200 of take-home from a $25,000 gig. State income taxation tin propulsion that lower.

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