Grandfathering means existing customers are exempt from a change. When you raise prices, restructure plans, or sunset a feature, grandfathered customers continue under the old rules. The name comes from a 19th-century US voting law that exempted those whose grandfathers had voted — the metaphor has stuck.
Why subscription merchants grandfather
- Trust. Customers who signed up at one price feel betrayed when raised. Grandfathering honors the original deal.
- Retention insurance. A price hike with grandfathering loses far fewer existing subscribers than a price hike without it.
- Marketing signal. "Lock in this price today before it goes up" becomes a credible acquisition message — but only if grandfathering is real.
- Legal protection. In some jurisdictions, materially changing subscription terms without consent is restricted. Grandfathering sidesteps the issue.
What gets grandfathered (and what doesn't)
Most common subjects of grandfathering:
- Price. Original monthly rate is preserved indefinitely or for a defined window.
- Plan features. Features removed from new plans remain available to legacy subscribers.
- Discount eligibility. Early-customer perks (free shipping, bonus product) continue.
- Cadence options. A 4-week cadence retired for new customers stays available to existing ones.
What's usually not grandfathered: minor product changes (formulation tweaks, packaging updates), shipping rates (which often pass through), and tax (which is jurisdiction-driven, not your choice).
How long should grandfathering last?
Three common approaches:
- Indefinite. Original price as long as the subscription remains continuously active. Most trust-building, most expensive long-term.
- Fixed window. "Your original price for 24 months, then transitions to current pricing." Compromise approach.
- Conditional. Original price as long as the customer doesn't change plans. Switching plans triggers a move to current pricing.
The downsides
Grandfathering creates a tail of low-margin customers that can become significant over years. A subscription business that has grandfathered three price increases may have one cohort paying 40% less than current rates — for the same product, with the same operating costs. Most operators eventually need to retire the oldest tier through either gentle migration offers or a defined sunset, communicated well in advance.
The other risk: customers comparing notes. With social media and review sites, hidden pricing differences surface. Grandfathered customers post about their lower rates, new customers ask why they pay more, and the comparison can damage the brand. Better to grandfather openly and explain the policy than to keep it quiet.
For related pricing topics, see tiered pricing and SaaS pricing strategy.