Every growing sales team reaches the point where the commission spreadsheet stops working. The usual next step is to buy software. A smaller number of companies build their own tool, and with AI coding assistants that number is rising. This post lays out when each option makes sense and what a build costs once you count everything.
Disclosure: IncentiveOps implements commission platforms for clients and also builds its own commission tooling. We have done both, and we have no commercial relationship with any vendor named here. We update this post as vendor prices change. Last updated November 2026.
You have three options, not two
Stay on spreadsheets. Free to license and expensive in time and errors once the team grows.
Buy a platform. A vendor maintains the engine and you configure your plans in it.
Build your own. Your engineers write and maintain the calculation logic, usually on top of your data warehouse.
For a small team, the spreadsheet is still the right answer. At least one vendor says so on its own pricing page, drawing the line at about ten people on variable pay. Below that, a well-built workbook with a second person checking it is enough.
What you are building
Teams that decide to build usually scope the calculation and forget the rest. A commission system that people will trust needs all of this:
A calculation engine that handles tiers, accelerators, splits, draws, clawbacks, and caps.
Effective dating. Plans, quotas, territories, and roles change mid-period, and the system has to know which version applied to which deal.
Data pipelines from the CRM, billing, and HR systems, with a way to catch bad records before they reach a payout.
Rep statements that show each deal and how it was paid.
Adjustments and disputes, with a record of who changed what and why.
Approvals before anything goes to payroll.
An audit trail that Finance and auditors can rely on, including accrual and ASC 606 support.
Access control, because this is pay data.
A payroll export in the format your provider needs.
The engine is the easy part. Effective dating and the audit trail are where home-built tools fall short, and they are the parts you only miss when something goes wrong.
What each option costs
For buying, published prices give a yardstick. At 50 users, QuotaPath lists $25,200 to $36,600 a year depending on tier, and Salesforce Spiff lists $45,000 a year before connectors. Quote-only vendors fall in and around that range. Our post on what ICM software costs has the detail.
For building, here is an illustration. The inputs are assumptions, so replace them with your own.
First version: one engineer for four months. At a fully loaded cost of $180,000 a year, that is $60,000.
Maintenance: a fifth of an engineer, ongoing. That is $36,000 a year.
Plan changes: every new plan year and every mid-year change is engineering work that waits in a queue with everything else.
On those assumptions a build costs $96,000 in year one and $36,000 a year after that. Against a $36,600 platform, the build saves $600 a year after the first, so it never pays back. Against a $51,000 platform it breaks even at the end of year four. The numbers move a lot with your inputs. What rarely changes is that license savings are a weak reason to build.
AI coding tools have lowered the cost of a first version. They have not lowered the cost of a wrong payout, and they do not remove the need for someone to own the system for years.
When building makes sense
Your plans do not fit a platform. Dealer and channel programs, usage-based pay with unusual crediting, or logic that vendors can only handle with workarounds.
Your data already lives in a warehouse with a team that maintains it, and commissions are one more model on top.
Compensation is close to your product. Marketplaces and agencies that pay many external parties sometimes need commission logic inside their own systems.
You have durable engineering capacity, meaning a named owner, not a side project.
When buying makes sense
Your plans are standard: quota attainment, tiers, accelerators, SPIFs.
Finance needs an audit trail and accrual support now.
Plans change every year and RevOps needs to make those changes without engineering.
Nobody in engineering wants to own payroll-adjacent software.
That list describes most B2B sales teams.
The middle path
Some teams buy a platform for calculation, statements, and audit, and build only the data preparation that feeds it. This works well when the hard part of your commissions is the data and the plan logic itself is ordinary. You keep control of the part that is specific to you and let a vendor carry the part that is the same for everyone.
Six questions that settle it
Can a platform model your hardest plan component without a workaround? Ask two vendors to show you.
Who will own a home-built tool in three years, by name?
How many plan changes did you make last year, and who would have coded them?
What does your auditor need to see, and can your build produce it?
What happens to commissions in the month your one engineer is on leave?
What is the three-year total for each option, with people included?
Our ICM build vs. buy calculator lets you run that last comparison with your own numbers. If you decide to buy, start with how to select an ICM platform and the ICM implementation checklist.
If you are weighing a build and want someone who has done both to look at your plans, schedule a working session.