Co-terming

When a customer buys an add-on eight months into a twelve-month contract, you have two choices. Give the add-on its own twelve-month term — leaving the account with two renewal dates — or co-term it: charge four months’ worth now and align it to the existing end date so everything renews together.

Co-terming is almost always the right answer for anything beyond a handful of accounts.

Why it is worth the proration

Without co-terming, a customer who has expanded four times has five renewal dates. That means five renewal conversations a year, five invoices to reconcile, five chances for one line to lapse unnoticed, and no single moment at which the whole relationship is reviewed.

With co-terming there is one date, one renewal quote covering everything, and one negotiation.

What it requires

The mechanics are straightforward proration — but they have to be applied to the initial partial period only, with the add-on then falling into the shared renewal cycle at full price. Systems that can only prorate mid-period changes to an existing charge, rather than align a new charge to an existing end date, force this to be done by hand.

The renewal quote then has to reassemble the whole account: base subscription, every add-on, current quantities, whatever discounts and uplifts apply. That is only straightforward when all of it lives on one subscription record rather than being spread across separate contracts that happen to share a customer name.