How to track net worth as a couple: yours, mine and ours

To track net worth as a couple, keep three ledgers: what's in your name, what's in your partner's name, and what you own together. Each ledger nets its own debts. Add the three and you have the household's net worth; add your ledger to your share of the joint one and you have yours.

Most couples keep one of the three. Some track only the joint accounts, the checking account and the house they both pay for. Others each track their own accounts and never add them up. Either way, nobody sees the whole picture, and the part that goes unseen is usually the larger one.

What does tracking only the joint accounts miss?

Take two partners with two incomes, $150,000 and $90,000, and:

• a joint checking account with $28,000
• a home in both names worth $700,000, with a $480,000 mortgage
• a joint credit card with a $4,000 balance
• in the first partner's name: a 401(k) worth $210,000 and an $18,000 car loan
• in the second partner's name: a 401(k) worth $95,000, a brokerage account from before they met worth $120,000, and a $22,000 student loan

The joint accounts, the ones both partners look at every month, add up to $244,000. The household's net worth is $629,000. The shared view shows about 39% of what the household owns.

How do you set up the three ledgers?

Put every account and debt in exactly one ledger, by whose name it's in:

Three rules keep it honest:

• Retirement accounts are titled to one person. A 401(k) or IRA is in one partner's name, even when both think of it as "ours", so it goes in that partner's ledger. (A spouse can still have rights in it under state community property law and federal plan rules; that's a question for the attorney, below.)
• Debts go where they're owed. A student loan or car loan in one name sits in that ledger, beside that partner's assets. Netting it against the joint accounts makes the joint picture look worse and the individual one better than either is.
• Moving money between ledgers isn't income or spending. When a partner moves $1,000 from their own account into joint checking, the household is no richer and no poorer. It's a transfer, and counting it as spending in one ledger and income in the other inflates both.

(To see a household laid out this way, the demo shows a fictional family's accounts, joint and individual, with no sign-up.)

What is each partner's share?

If the joint accounts are owned equally, each partner's net worth is their own ledger plus half of the joint one:

• First partner: $192,000 + $122,000 = $314,000
• Second partner: $193,000 + $122,000 = $315,000

"Owned equally" is this example's assumption, not a rule. How jointly held property is owned, and what happens to it if the relationship ends, depends on how it's titled, on state law (some states treat property acquired during marriage as community property) and on any agreement the partners have signed. Those are questions for an attorney. What the ledgers do is make the share visible, at whatever percentage applies, so the number exists before anyone needs it.

What is a dual-income household's savings rate?

The household saves $48,000 a year: each partner's 401(k) contributions, the second partner's brokerage deposits, and a monthly transfer from each partner into joint savings. On $240,000 of combined pay, that's a 20% savings rate.

The household rate is real, but it averages two different people:

Here the partner who earns less saves the larger share of their pay. Neither number is a judgment. Each partner's rate depends on what they put in, and the household rate can't show it. (To run your own numbers, the free savings rate calculator does the division.)

Why can the household rate hide a raise?

Now the second partner gets a $10,000 raise, and the household's spending rises by the same $10,000. Savings stay at $48,000 on $250,000 of pay. The household savings rate goes from 20% to 19.2%: a small move that looks like nothing happened.

What happened is that all of the raise was spent. Essay two called this the absorption ratio: the share of new income absorbed by new spending. Here it's 100%. The household rate barely moves because it averages a large, steady base with a small change, and a couple looking only at the combined number won't see it. Each partner's own rate, and the raise measured against the change in spending, will.

What changes when a couple combines finances?

In measurement terms, less than it feels like. Accounts opened together go in the joint ledger. Accounts that stay in one name stay in that partner's ledger, even after marriage. The ledger follows the name on the account; who owns it can differ under state law, as above. Retirement accounts stay in one partner's name. A home bought together goes in the joint ledger at whatever share the title and the law give each partner.

What does change is how often the ledgers need updating. A shared budget, planned against what was actually spent, belongs to the joint ledger; a shared bill paid from one partner's card belongs partly in each. Splitting that one transaction, instead of guessing, is what keeps both ledgers right.

Whether to combine accounts, how to title a home, and what a prenuptial agreement should say are legal questions, and this essay doesn't answer them.

What the software does, and what it does not do

Kept this way, each partner's accounts sit in their own portfolio and the joint accounts in a joint portfolio, and Eudos consolidates them into one household number; on the Family Office plan, entities carry each owner's percentage. The household can set each partner's share of each portfolio, and Eudos shows each partner's net worth and savings rate beside the household total. The shares are what the household sets, not a statement of legal ownership, which depends on title, agreements and state law.

Transfers between accounts connected to the same Eudos account are recognized as transfers, not income or spending. A shared budget runs on the joint portfolio, planned against actual, and split transactions file one payment across several categories. A partner can be invited to view or edit a portfolio, and a professional can be given view-only access to the portfolios the household chooses.

What it does not do is decide anything. It doesn't say whether to combine finances, how to own a home, or how much either partner should save. Those decisions stay with the couple and the attorney or adviser they hire.

Nothing here is advice: it's educational only, not investment, tax or legal advice. It's the arithmetic, explained plainly.

If you want the instrument behind the writing: Eudos is the wealth intelligence platform for wealth builders. It keeps each partner's accounts and the joint ones in their own portfolios, consolidates them into one household number, and shows each partner's share beside it. It's in private beta; the waitlist is at eudos.com.

To see a household kept this way, open the demo, a fictional family's wealth with no sign-up. The Thompsons have a joint portfolio, an LLC and a trust, each on its own books and consolidated into one family total.

The arithmetic, checked

• Joint ledger: $28,000 + $700,000 − $480,000 − $4,000 = $244,000.
• First partner's ledger: $210,000 − $18,000 = $192,000. Second partner's ledger: $95,000 + $120,000 − $22,000 = $193,000.
• Household: $192,000 + $193,000 + $244,000 = $629,000; the joint share: $244,000 ÷ $629,000 = 38.8%.
• Each partner's share (joint owned equally): $244,000 ÷ 2 = $122,000; $192,000 + $122,000 = $314,000; $193,000 + $122,000 = $315,000.
• Savings rates: first partner $27,000 ÷ $150,000 = 18%; second partner $21,000 ÷ $90,000 = 23.3%; household $48,000 ÷ $240,000 = 20%.
• After the raise: $48,000 ÷ $250,000 = 19.2%; absorption ratio $10,000 new spending ÷ $10,000 new income = 100%.
• All figures illustrative; before taxes and fees.