ISA or AI follow-up? How to work out the real cost

The honest way to compare an inside sales agent (ISA) with AI follow-up is cost per appointment, not salary versus subscription. Once you add management time, turnover and the hours nobody is covering, the numbers usually look different from what teams expect, in both directions.

This article gives you a framework to fill in with your own numbers. Every figure in the worked example is hypothetical and labeled that way. Plug in yours.

What does an ISA really cost?

An ISA costs more than their paycheck. The fully loaded monthly cost has six parts:

1. Base pay. Salary or hourly wage.
2. Payroll taxes and benefits. Employer taxes, health coverage, paid time off.
3. Commission or bonus. Per appointment set, per appointment held, or a split on closings.
4. Tools. Dialer, phone numbers, CRM seat, data or lead services, headset, workspace.
5. Management time. Hiring, training, call reviews, one-on-ones, covering sick days. This is the line most teams leave out.
6. Turnover and ramp. Recruiting costs and the weeks a new hire spends learning your market before they perform, spread across the months they stay.

For a market reference point, Indeed’s salary data for inside sales roles shows an average base salary of $62,239 a year across the US (based on job postings, updated September 21, 2026). That covers inside sales across industries, not real estate specifically, and it is base pay only, so treat it as a sanity check rather than your number. Your local market and comp plan are what count.

What does coverage actually mean for your leads?

Coverage is the share of the week someone can answer a lead. A full-time ISA works about 40 hours. A week has 168.

That gap matters because real estate runs on other people’s schedules. The Bureau of Labor Statistics notes that agents’ work schedules “often include evenings and weekends to accommodate clients’ schedules”. Leads browse and inquire on those same evenings and weekends.

To measure your own coverage:

• Covered hours per week = the hours someone is actually available to call or text a new lead.
• Coverage share = covered hours ÷ 168.
• After-hours leads = pull your last three months of leads and count how many arrived outside covered hours.

That last number tells you how many leads wait until morning, or Monday, for a first touch.

The formula: cost per appointment

Here is the core math. Run it for an ISA and for any AI option you are considering.

• Monthly cost = base + taxes and benefits + commission + tools + management time + turnover allowance
• Cost per appointment = monthly cost ÷ appointments set per month
• Value per appointment = average commission per closing × share of appointments that close
• Return per dollar = value per appointment ÷ cost per appointment

Use appointments that were actually held, not just booked, if you track the difference.

A worked example with hypothetical numbers

Say you run a small team and you are pricing a full-time ISA. These numbers are made up for illustration.

Now say this ISA sets 20 held appointments a month. Cost per appointment is $8,170 ÷ 20, or about $409.

Say your average commission per closing is $9,000 and 1 in 10 held appointments closes. Each appointment is worth about $900 to you. On these hypothetical numbers, every dollar spent on the ISA returns about $2.20.

Coverage: 40 of 168 hours, or about 24% of the week.

Now the other side. Forward Flow’s published pricing:

• Solo: $97 a month for 1 user.
• Large Team: from $147 a month for 2 users, plus $50 per extra user, up to 50 users.
• Build-out: $200 one time.
• Terms: month to month, no contract. Usage beyond the included tokens is billed as you go.

For a three-user team, the subscription is $197 a month plus the one-time $200. Add your expected usage charges and the time you would spend reviewing scripts and results, then divide by the appointments it sets for you. Do not use my assumptions for that appointment number. Measure it on your own leads.

Coverage on the AI side is different by design: Forward Flow gives a new lead its first touch within the first minute and runs each lead’s campaign at the hours that lead actually answers, rather than the hours someone happens to be at a desk (calls still respect quiet hours).

Where does a human ISA still win?

A human ISA is the better call in several situations, and it is worth being clear about them.

• You already have a great one. An experienced ISA who knows your market, your agents and your leads, and who converts well, is hard to replace. Do not break what works.
• The conversations are long and nuanced. Complex relocations, estate sales, divorces or luxury clients often need a patient, relationship-heavy conversation over many calls.
• You need more than calls. A person can also handle showing logistics, transaction coordination tasks, in-person events or office work.
• Your agents want a single human point of contact they can walk over to and brief.

Where AI tends to win is on speed, coverage and patience: a first touch within the first minute of a new lead, following up for months without fatigue, and reading every lead in a database instead of only the newest ones.

Should you use both?

For many teams the answer is both. A practical split:

• AI handles speed to lead, after-hours and weekend coverage, and long-term nurture of leads who are not ready yet.
• Your people take the conversations that are ready for a human.

Forward Flow is built for that hand-off. When a lead is ready to talk, it transfers the call to your agent live with a short brief on who they are and what they want, or books the appointment on your team’s calendar. Scripts, cadence, hours and hand-off rules are yours to approve and change.

If you want to go deeper on which leads deserve the human time, see our guides on lead scoring for real estate agents and reviving leads that went quiet.

Run the numbers, then test it

Fill in the table above with your own figures before you decide anything. Most teams have never written down the management-time line, and it changes the answer more than any other.

Then test the AI side on real leads rather than a spreadsheet guess. You can try Forward Flow as a lead in a few minutes, or book a 20-minute demo on your own leads and see the pricing on the pricing page.