Already in Business Together? Why Today's Numbers Are Tomorrow's Disputes

There's a common belief that partnership agreements are only for new partnerships — that if you and your partner have already been running the business together for five or ten years, the ship has sailed and there's nothing left to write.

From where I sit at the mediation table, the truth is closer to the opposite. The partners who most urgently need an agreement are often the ones who have been working together for years without one. A new partnership has expectations to align; an old partnership has history to reconcile — years of money in, money out, debts signed, and favors done — all of it living in two people's memories and nowhere else.

When existing partners finally write their agreement, that agreement does double duty. It sets the rules going forward, like any partnership agreement. But it also serves as something else: a photograph of today. It records how much each partner has put in, what the business owes, and who is responsible for what — as of right now, acknowledged by everyone. And here is the principle this whole article hangs on:

The numbers you don't write down today are the disputes of tomorrow.

Let me walk through what belongs in the photograph.

How much has each partner invested — to date?

This is the anchor question, and the key word is acknowledged. It's not enough for each partner to privately know what he put in. The agreement should state the figures that all sides agree on — even if the number for one partner is zero, that too should be stated plainly rather than left hanging.

"Invested" means more than wire transfers. One partner contributed a truck, inventory, equipment, or a machine he owned. Fine — agree on a dollar value for it now, note what it was, and record the agreed figure. If some amount genuinely cannot be pinned down — perhaps money went in gradually and records are thin — then write down exactly that: the estimate and the fact that both sides accept it. An imperfect number both partners have signed off on is worth infinitely more than a precise number one partner is carrying alone in his head.

Why so much emphasis? Because "I put in more than you ever knew" is one of the most common openings I hear in mediation — usually years later, usually unverifiable, and usually sincere. Both partners genuinely remember it their own way. The only cure is administered years earlier, in a single sentence both have signed.

What does the business owe — and who carries it?

Next are the debts: loans, credit lines, and bills payable. List them like a balance sheet — each debt on its own line. Then answer the question the balance sheet doesn't: who bears them? The natural default is that debts belong to the business, borne by the partners according to their ownership shares — but if your arrangement is different, now is the time to say so.

And there's a subtler question worth settling, one almost nobody thinks of: what if a debt from before the agreement surfaces later — something that wasn't on the list? An old bill, a forgotten obligation, or a claim from years back. Does everyone share it proportionally? Or should a partner who knew about it at signing and stayed silent carry it himself? There's a strong logic to the latter: the whole point of the photograph is full disclosure, and a partner shouldn't profit from leaving something out of the frame. Either way — decide it now, while it's hypothetical.

Personal guarantees: the question that surprises everyone

A personal guarantee (PG) means a partner has put his own name — and his own house, in practice — behind a business loan. If the business doesn't pay, the bank comes after him.

Here's what I've learned from live cases: partners often don't have a clear picture of who is standing on what. In one case I worked on, it turned out that both partners were personally exposed — each on different loans. Neither had quite realized the shape of it until we mapped it out.

So map it out. Who stands on a PG? On which loans, specifically? List them loan by loan.

Then comes the question with real teeth, and it is about the future: what happens to a PG when the partner behind it is bought out? Think it through — a man sells his share, walks away… and his name is still on the business's debt. The business goes on borrowing and operating, and his house is still the collateral. This must be addressed in the agreement: when a guaranteeing partner exits, the remaining partners must do everything in their power to get his guarantee removed — refinance, substitute, whatever it takes — and until it is removed, the business remains responsible for protecting him. Without that clause, a "clean exit" can be an illusion that follows a man home.

Loans from partners — and the partner who took out more

Two more pieces of history belong in the photograph, and they are mirror images of each other.

Sometimes the business owes a partner. A partner lent the business money over the years — beyond his investment. Write it down: who lent it, how much, and when it will be repaid. Will it be before any profits are distributed? On a fixed schedule? Relatedly, sometimes the investments themselves need sorting — which of the amounts partners put in are loans the business must repay, and which are equity that bought ownership. (That distinction — investment versus loan — is so important that it gets its own treatment later in the series, in the money chapters.)

And sometimes a partner owes the business — not through any loan, but through the quiet, common pattern where one partner has simply taken out more than the other over the years. A draw here, a personal expense there, a season where one needed cash and the other did not. Nobody minded at the time; it was all in the family. This came straight from a live case, and I can tell you exactly what it becomes if unrecorded: a decade later, the partner who took less has a running ledger in his heart, and the partner who took more has no idea the ledger exists.

The fix is to write down the imbalance — with the specific number — and choose a clear path to even it out. There are two clean ways: either the other partners first take an equal amount out of future profits before any further splitting, or the excess is treated as a loan that the partner owes the business and repays. Both work. What does not work is the third option most partnerships choose by default: leaving it as a feeling.

When a new partner — or new money — comes in

The third scenario for existing businesses: the business is up and running, and now a new partner or investor is buying in. This is a moment of maximum good feeling and maximum ambiguity, and the agreement should lay out the entire deal in the open.

What does the new partner bring? Money — how much, by when, and in what installments? If part comes now and part by a deadline, each amount and its deadline gets its own line. And beyond money — experience, contacts, a client base? Name it.

What does he get for it? The percentage, stated exactly. And from when does his ownership run — from the day of commitment, or from the day the money lands?

*And now the question that separates a clean deal from a future mediation: is the new partner responsible for the debts and obligations from before he came in?* There are two clean answers. Yes — he steps into the business as it stands, assets and debts together, as if he had been there all along. Or no — the old debts stay with the old partners, and the new partner shares responsibility only for what arises from today onward. There is also a fair middle path: the old debts stay with the old partners, except for specific listed debts the new partner has knowingly agreed to share — picked out by name from the debt list you just wrote (which is one more reason to have written it).

Every one of these answers is legitimate. The dispute does not come from choosing "wrong" — it comes from never choosing. The new partner assumes he bought into a clean slate; the old partners assume he took the business as-is; and the old debt, when it surfaces, lands in the gap between assumptions.

The photograph principle, one more time

If you have been in business with your partner for years and it is all working on trust and memory — this chapter is for you. Nothing about writing it down signals distrust. It signals the opposite: you trust each other today, so today is when your shared understanding should be captured — while you still agree on what it is.

Sit down while things are good. List what each of you has put in. List what the business owes and who is behind each debt. Surface the PGs. Settle the old imbalances. If someone new is coming in, write down the whole deal. It is an afternoon of work. I have watched the absence of that afternoon consume years.