Free tool
MSP Billing Leakage Calculator
Estimate how much revenue you're leaving on the table each month from unbilled or underbilled Microsoft 365 licenses. Adjust the sliders to your environment — then run the sample audit to see your actual numbers.
Estimate your exposure
How much are you leaking per month?
Adjust the sliders to your environment. Most MSPs lose 10–20% of billable seats per month — this is the cost of that gap.
Leakage rate is the percentage of billable seats not invoiced — industry surveys put the average at 10–20%.
Estimated monthly leakage
$1,125
That's $13,500/year in revenue you're not collecting.
Total licenses
500
Unbilled seats est.
75
Why do MSPs have billing leakage?
The gap between what you purchase from Microsoft and what you bill in your PSA grows silently. Every time a seat is added to a client's tenant in Partner Center, someone needs to update the corresponding billing line in ConnectWise, Autotask, or Kaseya. That step gets skipped more often than anyone admits.
Microsoft also renames products frequently. “Office 365 Business Standard” became “Microsoft 365 Business Standard”. The vendor bill changed; the PSA billing line didn't. Now the names don't match and the billing gap is invisible until someone looks.
The calculator above gives you an estimate. To see your actual gap — by client, by product, by dollar amount — upload your vendor and PSA CSVs and run the audit.
See how Leakage Finder handles your specific PSA: