Moving in with a relative can shrink an SSI check by as much as a third, and since September 30, 2024 the groceries someone else buys no longer count against it. Social Security says a payment may be reduced by up to one-third of the federal benefit rate when a recipient lives in another person’s household and does not pay all of the shelter costs.

On the 2026 rate of $994 a month, one-third is $331.33. That would leave a federal check of $662.67 at the most severe reduction. The cut is a ceiling, and the words “up to” are Social Security’s own: one-third is the most the rule takes, not a standard deduction.

Anyone on SSI who lives with a son, daughter, sibling or friend and is not covering their full share of the rent, mortgage or other shelter bills is the person this rule is aimed at. How much the check shrinks depends on how much of the shelter someone else covers, and the most it can take is a third.

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The most it can take, in dollars

Social Security states the reduction as a fraction, not a dollar figure. Applied to the individual rate of $994 that the agency’s 2026 SSI annual report lists, one-third works out to $331.33. New York’s 2026 benefit chart shows the result: the state Office of Temporary and Disability Assistance lists the federal amount for “living in the household of another” as $662.67, against $994 for a person living alone or with others.

The same fraction applies to couples. The chart lists $994 for a couple in this situation, which is $1,491 less one-third. Next year the base grows. Under Social Security’s 2027 fact sheet, the individual rate becomes $1,029, so the largest household reduction would be $343 and the lowest federal check $686.

New York adds its own $23 state supplement for that category, so the state’s chart totals $685.67 for an individual in someone else’s household. The same chart lists $1,081 for an individual who lives alone, which is the gap the living arrangement can make in one state.

Who the rule reaches

The rule is written for one situation. Social Security’s living-arrangements page, the 2026 edition, says it applies “if you live in someone else’s household and don’t pay your shelter costs or pay only part of your shelter costs.” In that case the SSI payment “may be reduced by up to one-third of the SSI Federal benefit rate.”

Two details matter. The person has to live in another person’s household, not in a place of their own. And the reduction is tied to shelter, meaning the cost of the roof, not to who happens to cook dinner.

What changed on September 30, 2024

Before that date, help with either food or shelter counted as in-kind support and maintenance, the term Social Security uses for outside help with living costs. The agency’s page says: “Prior to 09/30/2024, food or shelter are included in the ISM calculations.” Since September 30, 2024, food is out. The effective date is stated on the page as 09/30/2024.

Social Security’s guide to SSI income repeats the change and says the value of food no longer reduces SSI payments. A relative who buys the groceries is not lowering the check. A relative who pays the rent or the utility bills still can. The guide defines in-kind income as food or shelter received free or for less than fair market value, which is why the living-arrangements page covers people who pay only part of their shelter costs as well as those who pay none.

The separate limit on counted help

The living-arrangements page also sets a cap on how much outside help with shelter can be counted. It says the limit is “one-third of the maximum Federal SSI amount payable for a month, plus $20.” That is a second ceiling, built from the same one-third, and it applies when someone else helps pay living expenses.

Living with family can matter in a second way. The income guide describes deemed income, the part of a spouse’s, parent’s or sponsor’s income that is counted toward the SSI payment in certain living situations. That is a different rule from the one-third reduction, and the two are worked out separately.

The dollar figures here are 2026 amounts unless the 2027 rate is named, and the 2027 rate takes effect with next year’s payments. A recipient in a shared home who is unsure which category applies can ask Social Security directly at its office or on its national line. Which of the rules fits a particular household depends on who pays which bills. Social Security’s page says only that the payment “may be reduced,” and the actual amount for a given household is set by the agency after it looks at that household’s facts.

Sharing a home and a shelter bill?

For a recipient who shares a home, the stake is up to $331.33 a month on the 2026 rate, and the number depends on facts about who pays which shelter bills.

The SSI & Disability Action Kit sets out the 2026 SSI income and resource limits and the review and reporting steps, with an income and resource organizer for keeping track of what comes in and who pays what in the household.

Part 5 of the kit covers reviews, reporting and overpayments, the stage where a change in living arrangements gets raised with Social Security.

Get the 2026 SSI limits and an organizer for households that share a roof →

More Financial Reading

• 21 Ways to Stretch a $2,087 Social Security Check
• 15 Places to Find Your Share of the $4.25 Billion States Give Back
• 15 Ways Out of 22% Credit Card Interest

This article was produced with AI assistance and edited for accuracy against the sources linked above.