Sponsoring an immigrant family member: the affidavit of support

When you sponsor a family member for a US green card, the government asks you to sign something most people skim: an affidavit of support. It is not a formality. It's a legally enforceable contract in which you promise to financially support the immigrant and to repay certain government benefits they receive, and the obligation can survive events people assume would end it — including divorce. Sponsoring a relative is an act of love and often the right thing to do; signing the affidavit without understanding it is how that act turns into a financial liability nobody explained. This is what you're actually agreeing to.

What the affidavit actually obligates you to

By signing the affidavit of support (Form I-864 in most family-based cases), the sponsor promises two things. First, to maintain the sponsored immigrant at an income above a set percentage of the federal poverty guidelines — meaning if they can't support themselves, you're on the hook to help. Second, to reimburse the government for certain 'means-tested public benefits' the immigrant receives while the obligation is active. This is a contract with the government, enforceable by the government and, in some cases, by the immigrant themselves. It's a promise about money, backed by law, not a hope that things will work out.

The income requirement to be a sponsor

To sponsor, you generally must show income at or above a threshold tied to the federal poverty guidelines for your household size (including the immigrant you're sponsoring) — commonly 125% of the guideline, with a lower threshold for certain military sponsors. If your income alone doesn't meet it, you may be able to use assets or add a joint sponsor who independently meets the requirement and signs their own affidavit, taking on the same obligation. Because the poverty guidelines change annually, the article's guidance is to check the current figures for your household size rather than rely on a number that will be stale — the government publishes updated thresholds each year.

When the obligation ends — and when it doesn't

This is the part that surprises sponsors: the obligation does not end when you'd expect. It generally continues until the immigrant becomes a US citizen, is credited with a set amount of qualifying work (often described as 40 quarters, roughly ten years of work), permanently leaves the US, or dies. Critically, divorce does not end the obligation. A sponsor who divorces the spouse they sponsored is typically still financially responsible under the affidavit, and an ex-spouse has in some cases successfully sued a former sponsor to enforce the support promise. The obligation is to the government's requirement and to the immigrant, not to the marriage — so it can outlive the relationship that motivated it.

Weighing it before you sign

• Understand it's binding and durable: treat the affidavit like co-signing a long-term financial commitment, because functionally that's what it is.
• Confirm you meet the current income requirement for your household size, or line up a joint sponsor who understands they're taking on the same obligation.
• Think about the worst case honestly: could you support this person if their circumstances changed, and are you comfortable that the obligation may survive a falling-out?
• Get professional help: an immigration attorney for the process, and a quick word with a financial advisor if the obligation is large relative to your income.
• Keep copies of everything you sign — the affidavit is a contract you may need to reference years later.

The bottom line

The affidavit of support turns sponsoring a relative into a legally binding financial promise: to keep the immigrant above a set income level and to repay certain benefits, an obligation that generally lasts until citizenship, roughly ten years of work, permanent departure, or death — and notably survives divorce. None of that is a reason not to sponsor someone you love. It's a reason to sign with your eyes open: confirm you meet the current income threshold, understand the obligation's durability, and get an immigration attorney's review. The promise is real, so make it deliberately.