Cost synergies are the dollar savings a buyer forecasts when two organizations merge — duplicate costs removed so combined profit exceeds the sum of the parts.

How it works

Buyers build synergy models during diligence. Common buckets include headcount overlap (two finance teams become one), real estate consolidation, vendor renegotiation, and shared IT infrastructure.

Example: Company A spends $2M annually on cloud and support; Company B spends $1.5M on similar tools. After integration, a single stack might cost $2.5M — creating $1M in annual savings. Buyers often discount synergy value by a “realization factor” because integration takes time and fails partially.

In private equity roll-ups, cost synergies drive much of the investment thesis. In strategic tech acquisitions, savings may be smaller but still matter for public-company earnings narratives.

Why it matters

• Founders: If your startup removes a cost line for an acquirer, you have leverage in price talks. If integration means your product gets shelved, synergies hurt your team.
• Investors: Understanding synergy logic explains why strategics pay premiums and why some acquisitions look expensive on standalone metrics.

Common mistake

Assuming announced synergy targets fully materialize. Integration delays, culture clash, and customer churn routinely capture only a fraction of modeled savings.

Related ideas

See also corporate acquisition, bolt-on acquisition, revenue synergies, and integration planning.