The split you and your partner agreed on made sense at the time. Then one of you got a raise, or switched jobs, or picked up enough freelance work to change what "fair" actually looks like, and the old ratio just kept running because nobody wanted to be the one to bring it up.

Revisiting a budget split feels awkward in a way that setting one up the first time doesn't. Renegotiating can read as keeping score, even when the actual goal is making sure neither person is quietly carrying more than they should. That awkwardness is exactly why so many splits go stale, not because the math is hard, but because nobody wants to be the one who asks for a recalculation.

This guide covers when a split actually needs revisiting, how to recalculate it after a raise or a new job, what to do when income drops instead, and how to bring it up without it turning into a fight.

Quick answer: Revisit a shared budget split at least once a year, and immediately after a real trigger like a raise, a new job, a layoff, or a big pay cut. Recalculate a proportional split by adding both current incomes, dividing each person's income by the total, and applying that new percentage to shared costs. folk can hold the updated ratio in shared memory and apply it to every logged expense from there.

When does a shared budget split actually need revisiting?

Cathy Curtis, a certified financial planner who works with couples on exactly this, advises revisiting an income-based split every year as a baseline, even when nothing dramatic has happened, according to CNBC's reporting on how couples split costs. A slow drift, a small raise here, a rate increase on freelance work there, adds up without either person noticing exactly when the old ratio stopped matching reality.

Past the annual check, a few events should trigger an immediate recalculation rather than waiting for the yearly review:

• A raise or promotion. The math changes the moment the new paycheck starts landing, not whenever you get around to updating it.
• A new job, especially one with a meaningfully different salary than the last.
• A layoff or reduced hours, which needs a different response than a raise does, covered below.
• A shift from salaried to freelance or contract income, where the number itself becomes variable month to month instead of fixed.

If any of those happened and the split hasn't moved since, it's already out of date.

How do you recalculate a proportional split after a raise or new job?

The formula doesn't change, only the inputs do:

1. Add both current incomes together to get a new combined household income.
2. Divide each person's income by that total, then multiply by 100 for a percentage.
3. Apply that new percentage to every shared cost, replacing the old ratio.

If a $60,000 and $40,000 household (a 60/40 split) becomes $75,000 and $40,000 after a raise, the new combined income is $115,000, and the split moves to roughly 65/35. A $1,000 rent that used to break down as $600 and $400 becomes about $652 and $348. See how to split a shared budget with a partner or roommate for the full method if you haven't set a proportional split up yet.

The part worth saying out loud: a raise for one person doesn't mean the other person's dollar contribution should silently stay the same while the higher earner "just covers more." The percentage each person contributes stays anchored to their own income, which is what keeps the split feeling proportional instead of arbitrary.

What do you do when income drops instead of rises?

A layoff, reduced hours, or a slow freelance month is a different situation than a raise, and it usually calls for a different response than recalculating a new permanent ratio right away.

The immediate steps look less like renegotiating a split and more like triage. Regions Bank's guidance on adjusting a budget after job loss recommends listing every income source still coming in, from a final paycheck and unused vacation payout to unemployment benefits, separating fixed costs (rent, utilities, insurance, minimum debt payments) from flexible spending, and cutting the flexible spending first before touching anything fixed.

For the shared budget specifically, most couples handle a temporary income drop one of two ways:

• Pause the ratio, cover the gap from whoever still has income, dipping into shared savings if there's a real shortfall, and treat the old split as on hold rather than renegotiated.
• Recalculate temporarily using the new, lower number, with an understanding that it's a placeholder until the situation resolves.

Either works. What doesn't work is treating a temporary income drop as the new permanent baseline before you actually know if it's temporary.

How do you bring up renegotiating the split without it turning into a fight?

A few things make this conversation land better:

• Lead with the math, not the feeling. "My income changed, so the math changed" is a statement of fact. "I feel like I'm covering too much" invites a defensive response even when it's true.
• Bring the actual numbers, not a vague sense that something feels off. A specific new percentage is easier to agree to than an open-ended complaint.
• Frame it as maintenance, not a referendum on the relationship. An annual check-in is a normal thing responsible households do, the same way you'd revisit a lease or a subscription, not a sign something's wrong.
• Agree on the trigger list in advance, so a future recalculation doesn't require reopening the whole conversation from scratch. If you've both already agreed that a raise or a new job triggers a recalculation, bringing it up later is just following the plan you already made.

How folk tracks a split that changes over time

folk, the personal AI assistant that lives in your texts (iMessage, Telegram, and WhatsApp), doesn't decide when your split should change, but once you tell it, it holds the update so the math doesn't quietly drift again:

• It remembers the current ratio. Tell folk "we're now 65/35 instead of 60/40" and it updates the split in shared memory for the thread, replacing the old number rather than tracking two conflicting ones.
• It applies the new split going forward. Log a shared expense after the update and folk divides it using the new percentage automatically, as part of bill-split tracking in group chats.
• It answers "who owes what" from the current numbers. Either person can ask, in the same thread, without pulling up an old spreadsheet that still has the previous ratio baked in.
• It can watch a shared category if you connect a bank. Budgets and watch rules can flag if a shared category is running high under the new split, on top of the split itself. This is part of folk's paid plans.

folk doesn't move money between accounts or decide the split for you, whatever you settle up still happens through your normal payment app. What it removes is the part that actually causes drift: someone has to notice the change, do the math, and keep the running total straight afterward.

The bottom line

A shared budget split isn't a decision you make once. It's a number that should move when the incomes behind it move, on at least an annual check and immediately after any real trigger like a raise, a new job, or a layoff. The renegotiation itself is just arithmetic; the hard part is being willing to have the conversation before the old number has quietly stopped being fair to someone.

Get started with folk and tell it your updated split the next time your income changes. If you're setting a split up for the first time rather than updating one, how to split a shared budget with a partner or roommate covers the 50/50-versus-proportional decision from scratch, and if the income change is because you've gone freelance, how to budget with irregular income as a freelancer covers the individual side of a paycheck that moves every month.