SDR vs BDR: What's the Difference and Which Do You Need?
SDR and BDR are the two most confused titles in sales, partly because a good half of the industry uses them backwards. The useful distinction isn't the words — it's which direction the lead comes from and what the rep is paid on. Here's how the two roles actually differ, and how to decide which one you need first.
The split most companies use
| SDR | BDR | |
|---|---|---|
| Lead source | Mostly inbound — demo requests, content downloads, trials | Outbound only — cold accounts, no prior contact |
| First touch | Responding to interest that already exists | Creating interest that doesn't exist yet |
| Volume | Higher meeting count, warmer conversations | Lower meeting count, longer ramp |
| Measured on | Speed to lead, meetings held, conversion of inbound | Accounts penetrated, meetings sourced, pipeline created |
| Ramp time | 4–8 weeks | 3–6 months |
The caveat worth stating plainly: this is a convention, not a standard. Plenty of companies label their outbound reps SDRs and their inbound reps BDRs, and some use BDR for a partnerships role that isn't prospecting at all. When you read a job description, ignore the title and read the compensation plan.
Which one to hire first
If you have inbound volume you're not responding to within an hour, hire the inbound-facing role first — you're losing meetings that are already yours. Speed to lead is the single highest-leverage fix in most funnels, and it needs a person, not a strategy.
If you have no inbound to speak of, you need the outbound role, and you need to accept a longer ramp and a lower hit rate. The failure mode here is hiring one outbound rep, giving them a quarter, and concluding outbound doesn't work. One rep is not a test — it's a sample size of one against a list that may simply have been wrong.
Software does not split evenly across that line. Read the feature list of an AI SDR — cold accounts picked out and researched, a multi-step sequence run at people who have never heard of you, a meeting placed on a calendar at the far end, the activity synced to the CRM — and it maps almost item for item onto the right-hand column above. That list is what Laxis is sold on. Very little of it addresses what the inbound seat is really for, which is a human replying to a demo form inside the hour, before the interest cools. So it defers one hire far better than it defers the other.
Running both together
Teams that run both usually separate them by account tier rather than by channel: outbound reps work named target accounts, inbound reps work everything else. That avoids the most common turf problem, which is two reps touching the same company in the same week with different messages.
Whichever split you choose, write down who owns an account when a target-list company fills in a demo form. That single edge case causes more internal friction than any other. For how AI tooling changes the headcount math on both sides, see our AI SDR software guide.
Frequently Asked Questions
What is the difference between an SDR and a BDR?
In the most common convention, SDRs work inbound leads — demo requests, trials, content downloads — while BDRs do outbound prospecting into cold accounts with no prior contact. SDR roles ramp in 4–8 weeks and carry higher meeting counts; BDR roles ramp in 3–6 months with lower hit rates. The convention is not standardised, so check the compensation plan rather than the title.
Should I hire an SDR or a BDR first?
If you have inbound demo requests you are not answering within an hour, hire the inbound-facing role first — those are meetings you are already losing, and speed to lead is usually the highest-leverage fix available. If you have no inbound at all, you need the outbound role, and you need to budget for a longer ramp and accept that one rep is not a valid test of whether outbound works.
Can one person do both roles?
At small scale, yes, but the failure mode is predictable: inbound has deadlines and outbound does not, so the inbound queue always wins and outbound quietly stops happening. If one person must cover both, protect a fixed daily block for outbound the way you would protect a customer meeting.
How do you stop SDRs and BDRs from contacting the same account?
Split by account tier rather than by channel — outbound reps own a named target list, inbound reps take everything else — and write down explicitly who owns a target-list company when it fills in a demo form. That single edge case causes more internal friction than any other rule you will write.
