Private Lender Profit Split vs. Fixed Interest: Which Costs Less on Your Flip (and How Each Changes Your MAO)

Two Ways to Pay a Private Lender, and Why the Structure Matters to Your Offer

Most private money for flips comes in one of two shapes. The first is fixed debt. The lender charges an interest rate plus points, and you either pay interest monthly or let it accrue until the loan is paid off at sale. A typical quote might be 12% interest and 2 points on the loan amount, and you owe that cost whether the flip clears $60,000 or loses money.

The second is an equity-style profit split. The lender funds the purchase (and often the rehab), charges no interest, and takes a percentage of net profit when the property sells. A 50/50 split is common when the lender puts up all the cash, though the percentage is negotiable. If the deal makes nothing, the lender earns nothing, which is the trade-off they accept for a bigger slice of a winner.

These structures respond to different variables. Debt cost scales with time and loan size. A $200,000 loan at 12% with 2 points costs $4,000 in points plus $2,000 per month in interest, so a 6-month hold runs $16,000 and a 9-month hold runs $22,000. A split ignores the calendar and scales with profit. On a deal netting $40,000 before the lender is paid, a 50% split costs $20,000, but if profit shrinks to $24,000, the lender's share drops to $12,000.

That difference is why the structure changes your Maximum Allowable Offer. Your MAO has to leave room for rehab, buying, holding, and selling costs, and then your target profit. The lender's cost belongs in that stack before your target profit, not carved out of it afterward. If you want $25,000 for yourself and the lender takes $20,000, the deal has to produce $45,000 in net profit, which pushes your offer down.

Many investors run the 70% rule, land on an offer, and only later realize the lender's piece eats half their margin. Pricing the money first keeps you from overpaying at the contract stage, when the number is still yours to set. Treat the cost of capital like any other line item, because the lender will collect it either way.

Worked Example: The Same $300K Flip Under Both Structures

Here is a typical suburban flip so you can see the gap in real dollars. The ARV is $300,000, you buy at $165,000, and the rehab runs $45,000. Buying costs come to $3,300 (2% of purchase), holding costs are $600 a month for six months ($3,600), and selling costs are $24,000 (8% of ARV). Before any financing cost, the deal produces $300,000 minus $165,000, $45,000, $3,300, $3,600, and $24,000, which equals $59,100.

Under the fixed option, the lender funds $210,000 (purchase plus rehab) at 10% annual interest plus 2 points. Six months of interest is $210,000 x 10% x 0.5, or $10,500. The points are $210,000 x 2%, or $4,200, usually paid at closing. Your total cost of money is $14,700, which leaves you $44,400 in profit.

Under the split option, the lender funds the same $210,000 but charges no interest or points. Instead, they take 50% of the profit when the house sells. Half of $59,100 is $29,550 to the lender, and the other $29,550 goes to you. That feels friendlier on day one because nothing comes out of your pocket until the sale closes.

Put the two side by side and the difference is hard to ignore. The fixed lender earns $14,700, while the split lender earns $29,550, roughly twice as much for funding the identical deal. You walk away with $14,850 less under the split. On a clean six-month flip where the budget and timeline hold, the profit split is the expensive money.

That result is not a universal rule, though. It depends on two variables: how large the profit is and how long you hold the property. A fatter spread makes a split more costly to you, while every extra month adds interest to the fixed loan. Those two forces decide which structure wins on any given deal, and they also change how much you can afford to offer.

Worked Example: Solving for MAO and the Break-Even Hold Time

Profit at a given price is useful, but the real question is what you can offer. Work backward from a $35,000 target profit. Under fixed-rate debt, the deal math simplifies to profit = $224,250 minus 1.09 x purchase price. The 1.09 multiplier folds in closing costs plus the points and interest that scale with the loan.

Set profit to $35,000 and solve. $224,250 minus $35,000 is $189,250, and $189,250 divided by 1.09 is about $173,600. That is your MAO with fixed-rate money. Under the 50/50 split, you keep only half the profit pool, so the pool must reach $70,000. The pool equals $227,400 minus 1.02 x purchase (buying costs only, no interest). That means 1.02 x purchase = $157,400, and dividing by 1.02 gives an MAO of about $154,300.

The gap is roughly $19,300. On the same house, with the same ARV and rehab, the split forces a lower offer just to hit your number. In a competitive market, that difference can decide whether you win the contract or watch another flipper close it.

The split does have one advantage: its cost shrinks as the hold drags on, because a longer hold erodes profit and the lender's half falls with it. Here the split costs $31,350 minus $300 per month, while fixed debt costs $4,200 plus $1,750 per month. Set them equal: $27,150 = $2,050 x months, so the crossover lands near 13.2 months.

• At 6 months: split $29,550, fixed $14,700
• At 13 months: split $27,450, fixed $26,950
• At 14 months: split $27,150, fixed $28,700

Unless you expect a hold past about 13 months, fixed money is cheaper on this deal. Running this comparison requires solid base inputs. FlipSmrt's MAO output gives you the ARV from adjusted comps, a county-priced rehab budget, and buying, holding, and selling costs. Plug those into each structure's formula to see your true offer ceiling before you call the lender.

Nuances: Preferred Returns, Hybrids, Overruns, and Who Bears the Risk

Many private lenders won't offer a pure split or a pure rate. A common hybrid is a lower rate plus a smaller split, such as 6% interest plus 20% of the profit. Another is a preferred return, where the lender takes the first 8% annualized on their capital, and only then do you split what remains, often 70/30 in your favor. Always read the payout order (the "waterfall"), because it decides who gets paid first when the profit comes in small.

The biggest difference shows up when a deal goes wrong. Say a lender funds $250,000 for six months and you project $60,000 in profit before financing costs. Then rehab runs $15,000 over budget and the house sells $10,000 below ARV, cutting profit to $35,000. On a 50/50 split, the lender's share drops from $30,000 to $17,500, so you absorb only half of the $25,000 hit. On a 12% fixed loan, the lender still collects $15,000 ($250,000 x 0.12 x 0.5), so your net falls from $45,000 to $20,000 and you absorb the entire $25,000.

Fixed loans also carry fine print that raises costs on slow flips. A minimum-interest clause might charge six months of interest even if you sell in three. Extension fees of 1 point per 30 days past the term add up fast, and a default rate can kick in if you miss the maturity date. Add origination points to all of this before comparing the loan to a split.

Check how the lender releases rehab money. If rehab is funded in draws, you pay interest only on what has been drawn, which lowers your cost. However, you may need to front the work and wait on inspections before the lender reimburses you. Ask who pays the draw inspection fee and how many days the lender takes to release funds, because slow draws stretch your timeline.

Think of the split as insurance. On a fast, fat deal, it costs more than interest would. On a slow or thin deal, it shares the pain and costs less. Pay for that insurance when your margin is tight, the scope is uncertain (old wiring, foundation questions), or local prices are softening.

Common Mistakes When Pricing Private Money Into a Deal

Most private money mistakes come down to cost that shows up in the deal but never made it into the spreadsheet. Each one below uses the $300K ARV flip from earlier: a $180K purchase, a $40K rehab, and a lender funding both at 12% plus 2 points, or a 50/50 profit split.

1. Running the 70% rule and ignoring financing entirely. The formula gives you ($300,000 x 0.70) - $40,000 = $170,000. But 6 months of interest on $220,000 is $13,200, and the 2 points add $4,400. That $17,600 comes straight out of the 30% margin you thought was protecting your profit.
2. Calculating interest on the purchase only. Interest on $180,000 for 6 months is $10,800. If the lender also funds the $40,000 rehab, the real figure is $13,200 (assuming the rehab is drawn up front). That is $2,400 you never budgeted.
3. Splitting profit that was never real. If you projected $50,000 in profit but understated holding costs by $6,000, your 50% share drops from $25,000 to $22,000. You may have said yes to a deal based on a number that was $3,000 too high.
4. Assuming a 6-month hold with no buffer. Each extra month at 12% on $220,000 costs $2,200. A permit delay that pushes you to 9 months adds $6,600 in interest, plus taxes, insurance, and utilities.
5. Taking a split on a high-margin deal. On a $50,000 profit, the lender's half is $25,000. Fixed debt would have cost $17,600. That is $7,400 you gave away on a deal that never needed shared risk.

The pattern is the same in every case. The cost exists whether or not you model it, so leaving it out only means you find it after you have already made your offer. Build interest on the full funded amount, points, and a realistic hold into your MAO before you talk to the seller.

A good habit is to run every deal at both 6 and 9 months and under both structures. If the deal only works in the best-case column, you have your answer before you commit.

FAQ: Private Lender Splits and Fixed Rates

Is a profit split ever cheaper than interest on a fast flip? Only when the profit is thin. A $200,000 loan at 12% held four months costs $8,000 in interest, while a 50% split of a $40,000 profit costs $20,000. The split wins only if the profit drops below $16,000, the point where half the profit equals the interest. On a fast, healthy flip, fixed interest almost always costs less.

How do I explain a split to a first-time private lender? Keep it to one page and real numbers. Say they fund the purchase and rehab, they hold a first-position lien, and they receive an agreed share of net profit when the property sells. Show the math: on a projected $45,000 net profit, a 40% split pays them $18,000. Also define "net profit" in writing so closing costs and overruns are not argued about later.

Should points be counted as a holding cost or a buying cost? Treat points as a buying cost. You pay them at closing whether you sell in three months or ten, so they do not scale with time. Two points on a $200,000 loan is $4,000 up front. Interest belongs in holding costs because it grows every month you own the property.

Can I use a split for a BRRRR where there is no sale? Yes, but you need a trigger event to replace the sale. Common options include paying the lender a share of the cash-out at refinance, a share of appraised equity, or a percentage of monthly cash flow for a set term. Spell out the appraisal method and the deadline, because an open-ended equity stake gets messy fast.

How do I compare offers quickly before I write a contract? Hold ARV, rehab, and hold time constant, then swap only the financing cost. Running the address through FlipSmrt's first 3 free analyses gives you ARV, rehab, and a baseline MAO in under 5 minutes. From there, subtract each lender's total cost to see which structure leaves the higher offer, and therefore the better deal.