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Agency vs In-house Cost Modeler·Comparison

The real cost of building versus buying a marketing team

Most comparisons put a salary next to a retainer and stop there. This one loads both sides properly, counting employer burden, recruitment, ramp, tooling, attrition and the management time nobody books, then prices the hybrid too.

FreeNo sign-upThree routes compared
Nine roles with salary benchmarksModels attrition and ramp12 to 60 month horizon
agency-vs-inhouse.strateqx.com/model
Agency, year one
$144k
Retainer plus tooling
In-house, year one
$198k
Fully loaded
Crossover
Month 29
Where in-house wins
What in-house actually costs
 Annual
Salaries (2 roles)$141k
Employer costs and benefits$31k
Tooling and subscriptions$18k
Management time$8k

Headline salary is barely two thirds of the real figure. Comparisons that stop at the retainer against the salary are the reason in-house moves so often disappoint on cost.

Why this tool exists

The problem

The decision to hire a marketing team or retain an agency is usually made on a comparison that is wrong by a wide margin: a salary figure next to a retainer figure. One of those numbers is nearly complete and the other is roughly two-thirds of the real cost.

Why traditional approaches fail

In-house cost is not salary. It is salary plus employer burden, plus recruitment, plus the tooling an agency would have included, plus the leadership hours spent managing people, plus a ramp period during which a new hire produces a fraction of their eventual output at full price, and then all of it again every time someone leaves. Agency cost, meanwhile, is rarely just the retainer: onboarding fees, pass-through costs and annual escalation all belong in the comparison.

Why this AI-powered approach is different

This modeler prices all three routes across a horizon you choose, with every hidden cost exposed as its own line. It also reports what cost alone cannot tell you: capability coverage, time to full output, and cost through the critical first six months.

Expected outcomes
  • Total cost of in-house, agency and hybrid across 12 to 60 months
  • The breakeven month where in-house becomes cheaper, or proof there isn't one
  • A full cost breakdown showing which hidden line is actually driving the answer
  • Capability coverage and time-to-output for each route
  • The strengths and risks of each option, stated plainly

Who it's for

Anyone about to sign an employment contract or a retainer.

Founders

Deciding whether the first marketing hire or an agency comes first.

CMOs

Building a case for headcount against an incumbent agency.

Finance Teams

Need fully loaded costs, not a salary line, before approving a hire.

HR & Talent

Quantify what attrition and ramp actually cost the marketing plan.

Ops Leaders

Model the hybrid split between an internal lead and outsourced delivery.

Agencies

Show a client the total cost of the in-house alternative, honestly.

Scale-ups

Time the transition from agency to internal team correctly.

SMBs

Get full capability coverage without funding six salaries.

How it works

Pick the capabilities, set the assumptions, compare the routes.

1Select capabilities

Nine roles with salary benchmarks, and you can override any of them

2Set the true-cost inputs

Burden, recruitment, attrition, tooling and management hours

3Describe the agency option

Retainer, onboarding, pass-throughs and annual escalation

4Compare all three

Cumulative curves, breakeven month, and coverage beyond cost

Features

The lines a napkin comparison leaves out.

Nine benchmarked roles

Head of Marketing through to Social Media Manager, each with a salary benchmark, ramp period and agency-equivalent rate.

Fully loaded in-house cost

Employer burden, recruitment fees, salary inflation, tooling and management hours, all as separate visible lines.

Attrition modelling

Every expected departure re-triggers the recruitment fee and another ramp period, which is where multi-year in-house cases quietly break.

A real hybrid option

Choose which capabilities stay internal; the rest are priced at agency rates, with a reduced scope and reduced management load.

Cumulative cost curves

Where the lines cross is the month the cheaper route changes, usually later than the in-house advocate expects.

Coverage and speed

Capability coverage and months-to-full-output, because two routes at the same price are not the same decision.

What you'll get

Enough to take into the meeting where this gets decided.

Total cost per route

In-house, agency and hybrid across your chosen horizon.

Breakeven month

When in-house cumulative cost drops below the agency's, if it does.

Line-by-line breakdown

Which hidden cost is actually driving the difference.

Capability coverage

How much of what your plan requires each route actually covers.

Time to full output

Months before each route is producing at capacity.

CSV export

Every line and every month, ready for the finance model.

See it in action

Preview

The modeler is live at the top of this page with a four-role team loaded.

agency-vs-inhouse.strateqx.com/model
Agency, year one
$144k
Retainer plus tooling
In-house, year one
$198k
Fully loaded
Crossover
Month 29
Where in-house wins
What in-house actually costs
 Annual
Salaries (2 roles)$141k
Employer costs and benefits$31k
Tooling and subscriptions$18k
Management time$8k

Headline salary is barely two thirds of the real figure. Comparisons that stop at the retainer against the salary are the reason in-house moves so often disappoint on cost.

Why it changes the decision

Ends the salary-versus-retainer fallacy

Once burden, recruitment and tooling are on screen, the in-house number typically rises 40–60%, and the comparison finally becomes fair.

Prices speed

An agency is producing in week two; a team of four is at full output in month five. That gap has a cost, and it is now visible.

Makes attrition real

At 18% annual attrition over three years, the recruitment line stops being a rounding error.

Takes the hybrid seriously

The option most companies eventually land on, priced properly rather than treated as a compromise.

Use cases

Where the model settles the question.

First marketing hire
Problem

Founder weighing one generalist against a small agency retainer.

How the tool helps

Model a single Head of Marketing at full burden against the retainer.

Expected outcome

Usually a hybrid: an internal owner for strategy with agency execution, at similar total cost and much wider coverage.

Bringing an agency in-house
Problem

Retainer feels expensive after three years and the team wants to internalise it.

How the tool helps

Model the four or five roles needed to replace the agency scope, at real market salaries.

Expected outcome

A breakeven month that is often further out than expected once recruitment and ramp are included.

Building a business case for headcount
Problem

Finance sees a salary request; marketing sees a capability gap.

How the tool helps

Export the full cost breakdown for all three routes.

Expected outcome

A conversation about coverage and speed rather than one about a salary band.

Deciding after losing a key person
Problem

A departure has left a capability gap and a hiring cycle ahead.

How the tool helps

Compare replacing the role against outsourcing that capability for the interim.

Expected outcome

A costed answer to whether to bridge with an agency or wait for the right hire.

How the model works

In-house cost is built month by month from salary, inflated annually, multiplied by employer burden, with recruitment landing in month one and again for each expected replacement given your attrition rate. Tooling and management time are added every month. Nothing is hidden in an overhead percentage: each line is visible and adjustable.

Agency cost is the retainer escalating annually, plus onboarding in month one, plus pass-through costs, plus your own time managing the relationship. Agencies are cheaper to manage than employees, but they are not free to manage, and that time belongs in the comparison.

The hybrid re-prices the outsourced roles at their agency-equivalent monthly rates rather than at your full retainer, with a reduced onboarding fee and halved management load, which reflects how these arrangements actually work when an internal lead owns the brief.

Time is a cost

Ramp periods and time-to-full-output are reported alongside cost, because the fastest route and the cheapest route are rarely the same one.

Attrition compounds

Each departure costs a fee plus a ramp. Over a three-year horizon this line frequently decides the answer.

Coverage over headcount

The model tracks which capabilities each route covers, so you can see when a cheaper option is cheaper because it does less.

Frequently asked questions

Related resources

The decisions on either side of this one.

Price the decision before you commit to it

An employment contract and a twelve-month retainer are both hard to reverse. Ten minutes with the full cost picture is cheap by comparison.