How to Split Rent With a Partner by Income (With Math)

Moving in together is exciting right up until the first rent payment. If you earn about the same, 50/50 is easy. If one of you earns noticeably more, 50/50 can quietly squeeze the other person every single month.

There's no single right answer. This guide shows the two main options, a hybrid many couples use, and the math for each, so you can pick the one that feels fair to both of you.

This is general information, not financial or legal advice.

50/50 vs proportional: what each one assumes

50/50 assumes you share the home equally, so you share the cost equally. It's simple, and it keeps money separate. The downside: if one partner earns much less, rent takes a much bigger bite of their paycheck, and they may have far less left over for savings or fun.

Proportional assumes you're a team with different incomes, so each of you pays the same percentage of your income. The higher earner pays more in dollars, but both of you are left with a similar share of your own money.

Reddit threads on this go both ways. Some people feel 50/50 is the only fair way between equals (r/relationship_advice). Others see proportional as the only way to avoid one partner always being the one who can't afford dinner out.

The formula

Your share = your income ÷ combined income.

That's it. Apply the percentage to whatever you decide to split this way.

Worked example: $90k + $60k, $2,400 rent

• Partner A earns $90,000 a year.
• Partner B earns $60,000 a year.
• Combined: $150,000.

Shares:

• A: 90,000 ÷ 150,000 = 60%
• B: 60,000 ÷ 150,000 = 40%

Rent of $2,400 a month:

• A: 60% × $2,400 = $1,440
• B: 40% × $2,400 = $960
• Total: $2,400

Compare 50/50 rent: $1,200 each. Proportional moves $240 a month from B to A.

The popular hybrid: rent by income, groceries and utilities 50/50

A common pattern in a recent r/personalfinance thread: split rent by income ratio, split everyday costs evenly, and recalculate once a year (r/personalfinance). The logic is that you both eat and use the lights about equally, but housing is the big fixed cost where income gaps hurt most.

Same couple, with $800 a month of groceries and utilities:

• Rent: A $1,440, B $960
• Groceries and utilities, 50/50: A $400, B $400
• A's total: $1,440 + $400 = $1,840
• B's total: $960 + $400 = $1,360
• Check: $1,840 + $1,360 = $3,200 ($2,400 + $800)

Now compare the three options for the full $3,200:

• 50/50 on everything: A $1,600, B $1,600
• Hybrid: A $1,840, B $1,360
• Proportional on everything: A $1,920 (60%), B $1,280 (40%)

The hybrid is a $240 monthly "income-gap adjustment" compared with 50/50. Proportional on everything is $320. Seeing the actual dollar figure often settles the debate faster than arguing about principles.

Quick guide by income gap (the gap is the difference divided by the higher income):

• Gap under 10%: 50/50 is usually fine. The difference is small.
• Gap of 10% to 30%: the hybrid is a good middle ground.
• Gap over 30%: consider proportional on everything, or the hybrid with more costs moved into the proportional bucket.

In our example the gap is (90,000 − 60,000) ÷ 90,000 = 33%, just over the 30% line, so either the hybrid or full proportional makes sense.

Gross or take-home income? Pick one and write it down

Both work. What matters is that you use the same one for both partners.

• Gross income is simple and stable, and it's on your offer letter.
• Take-home pay reflects what actually lands in your account after taxes, retirement contributions and benefits, which can differ a lot between two jobs.

Illustrative example with take-home pay of $5,600 and $4,000 a month:

• Combined: $9,600
• A: 5,600 ÷ 9,600 = 58.33%; B: 41.67%
• Rent: A $2,400 × 5,600 ÷ 9,600 = $1,400; B $1,000

That's $40 a month different from the gross-income version. Small, but worth agreeing on so nobody feels the formula was picked to suit them.

When one partner owns the home

This changes the conversation. A partner who doesn't own the place isn't building equity by paying the mortgage. There are two common approaches:

1. Share the costs, not the mortgage. The partner who doesn't own pays a share of the running costs: utilities, internet, groceries, maybe a contribution toward insurance and taxes. The owner covers the mortgage, since it builds their asset.
2. Charge fair rent. The partner pays a set rent, often below market, and the owner treats it like any landlord would.

A thread from a homeowner asking what to charge a girlfriend shows how many opinions there are, from covering only the bills to paying market rent (r/FirstTimeHomeBuyer). If you're married or planning to be, laws about shared property vary, so this is worth a conversation with a professional.

Stop "constant Venmo": keep a running balance

The fastest way to make money feel tense in a relationship is paying each other back after every grocery run. People in that same r/personalfinance thread said they wanted to avoid constantly sending money back and forth.

A calmer system:

1. Each of you pays bills and groceries as they come up.
2. Log each one with the agreed split (percent for rent, 50/50 for groceries).
3. Once a month, look at the running balance and settle it with one payment.

One payment a month is much easier than thirty. The same idea scales to bigger groups; see settling group expenses with the fewest payments.

Settleo for iPhone (coming to the App Store) can split by percent or by shares and shows the running balance between you. In the US, it can open Venmo with the amount filled in and then asks "Did you pay?" so nothing gets marked paid by accident. There's also an optional Face ID lock if you'd rather keep the app private.

Review once a year

Incomes change. A raise, a new job or going back to school can shift the ratio a lot. Pick a date to recalculate and put it in both calendars. Tax time works well, because you'll have your income numbers in front of you anyway.

For the general logic behind percent and share splits, see our guide to weighted expense splits for couples and shared households. If you're sharing a place with roommates as a couple, the room-size math in how to split rent with different room sizes covers that case.

FAQ

Is splitting rent 50/50 unfair if we earn differently?

Not automatically. It depends on the size of the gap and what you both value. If the gap is small, 50/50 is simple and fair. If it's large, 50/50 can leave one partner with much less of their own money each month.

Should we use gross or net income?

Either, as long as you use the same one for both of you and write it down. Take-home pay reflects reality better when your jobs have very different deductions.

What should I charge my partner if I own the house?

Common options are sharing running costs only, or charging a set rent below market. There's no standard figure. If marriage or shared ownership is on the table, get professional advice.

Should we open a joint account?

Some couples use a joint account for shared bills and keep personal accounts separate. Others keep everything separate and settle monthly. Both work; the right choice depends on your situation, and this isn't financial advice.

How often should we recalculate?

Once a year, plus whenever one of your incomes changes significantly.