Why It Matters
Think of accounts payable as the stack of bills on your desk. A contractor finished your bathroom renovation and sent a $4,500 invoice due in 30 days — that's AP. Your semi-annual property tax bill arrived for $3,200 — that's AP. Your insurance premium renewal is sitting in your inbox — AP again.
These are real obligations, even if the cash hasn't left your bank account yet. And that distinction matters. You might look at your checking account, see $20,000, and feel comfortable. But if you've got $12,000 in unpaid contractor invoices, a $3,200 property tax bill, and $1,800 in insurance premiums due — your actual available cash is $3,000. AP is the difference between what your bank balance says and what you actually have to work with.
For buy-and-hold investors, tracking AP keeps your cash flow projections honest. For flippers, it's even more critical — unpaid contractors can file mechanic's liens against your property, clouding title and killing your sale.
At a Glance
- What it is: Money you owe for goods or services already received but not yet paid
- Balance sheet classification: Current liability (typically due within 30-90 days)
- Common RE examples: Contractor invoices, property tax bills, insurance premiums, HOA dues, management fees
- Key tracking tool: AP aging report showing 0-30, 31-60, 61-90, and 90+ day buckets
- Warning threshold: Anything past 60 days signals cash flow stress or bookkeeping neglect
- Worst-case risk: Mechanic's liens from unpaid contractors (60-120 day filing window in most states)
How It Works
AP is created when you receive a bill. The moment a contractor finishes work and hands you an invoice, or your county mails a property tax bill, you have an accounts payable. The service or obligation exists — you just haven't paid for it yet. On your balance sheet, AP sits under current liabilities because it's due within the near term.
Cash basis vs. accrual basis. Most small landlords use cash-basis accounting — you record expenses when you pay them, not when you owe them. Under cash basis, AP doesn't formally appear in your books. But the bills still exist. Accrual-basis accounting (what larger property operations use) records the expense when incurred, creating a formal AP entry that clears when paid. Either way, the money is owed — the question is whether your books reflect it.
The aging report. This is your AP management tool. It groups unpaid bills into buckets: current (0-30 days), 31-60 days, 61-90 days, and 90+ days past due. A healthy AP aging report has most items in the current bucket. When bills start sliding into the 60-90+ day range, it means one of two things: you don't have the cash to pay (a cash-on-cash return and cash flow problem), or you're not managing your payables (a bookkeeping problem). Both need fixing.
AP and your NOI. Operating expenses in your NOI calculation should reflect what you owe for the period, not just what you've paid. If you incurred $8,000 in expenses this quarter but only paid $5,500, your NOI looks artificially high — the missing $2,500 in AP is a real cost you haven't accounted for yet. Accurate AP tracking keeps your performance metrics honest.
Real-World Example
Carla is mid-way through a flip and managing three active contractor relationships. Here's her AP on March 15th:
- Plumber: $3,800 invoice (received Feb 20, due March 20) — 24 days old
- Electrician: $5,200 invoice (received Feb 1, due March 1) — 42 days old, past due
- Roofer: $9,500 invoice (received Jan 10, due Feb 10) — 63 days old, significantly past due
- Property taxes: $2,100 (due April 1) — current
- Insurance: $1,400 (due March 30) — current
Total AP: $22,000. Carla has $28,000 in her project account. She feels fine — until she maps it out:
Available cash after AP: $28,000 - $22,000 = $6,000 actual liquidity. And she still has painting ($3,500) and flooring ($4,200) left to complete.
The roofer's invoice at 63 days is the urgent problem. In Carla's state, contractors can file a mechanic's lien after 90 days. That lien would cloud title and delay her sale. The $9,500 she owes the roofer could cost her $40,000+ in carrying costs if the sale stalls.
Carla pays the roofer immediately, negotiates Net 45 terms with the flooring contractor, and sets up a weekly AP review. Her total rehab costs land at $52,000 — but she avoids a lien and closes on schedule.
Pros & Cons
- Preserves cash flow flexibility — Paying on terms (Net 30) rather than immediately keeps cash available for other needs
- Tracks real obligations — Knowing exactly what you owe prevents the false comfort of a fat bank balance
- Supports vendor relationships — Paying on time builds trust with contractors who'll prioritize your projects
- Essential for due diligence — Reviewing a property's AP aging report before acquisition reveals hidden liabilities
- Enables accurate financials — Proper AP tracking produces honest NOI and cash flow numbers
- Prevents legal exposure — Timely contractor payments eliminate mechanic's lien risk
- Adds bookkeeping complexity — Tracking what's owed vs. what's paid requires more discipline than simple cash-basis recording
- Cash flow illusion — Bills accumulate quietly; AP can grow faster than you realize if you're not reviewing aging reports regularly
- Late fees compound — Property tax penalties (1-10% depending on county), insurance cancellation risks, and contractor surcharges for late payment add up
- Inherited liability risk — Buying a property via entity purchase (not asset purchase) can make you responsible for the seller's outstanding AP
- Small landlords often skip it — Cash-basis accounting doesn't require formal AP tracking, so many investors don't discover their AP problem until it's a crisis
Watch Out
Mechanic's liens are the real threat. In most states, unpaid contractors can file a mechanic's lien against your property within 60-120 days of completing work. That lien attaches to the title, meaning you can't sell or refinance until it's resolved. For flippers, a mechanic's lien can blow up a deal entirely. Pay contractors within terms, or at minimum communicate proactively about payment timing. Silence is what triggers lien filings.
Don't confuse bank balance with available cash. Your bank account shows $35,000 but you owe $18,000 in AP — you have $17,000. New investors routinely commit to their next deal based on the bank balance, not the net-of-AP position. Before you put down earnest money on property #4, subtract everything you owe.
Check AP during due diligence. When acquiring a property — especially via entity purchase — request the AP aging report. Outstanding payables to contractors, utilities, or the HOA may transfer to you. A property with $8,000 in 90-day-past-due AP tells you something about the seller's financial situation and maintenance habits.
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The Takeaway
Accounts payable is the money you owe but haven't paid — contractor invoices, property tax bills, insurance premiums, and every other obligation sitting between "received" and "paid." It's a current liability on your balance sheet that directly affects your real cash position. For buy-and-hold investors, tracking AP keeps your NOI and cash flow projections honest. For flippers, it's the difference between a clean closing and a mechanic's lien that stalls your sale. Run an aging report monthly, pay within terms, and never mistake your bank balance for available cash. The bills on your desk are real money — act like it.