SDR vs BDR: What Actually Differs, and How to Design the Roles So the Difference Matters

An SDR (sales development representative) and a BDR (business development representative) do the same core job: create qualified meetings or opportunities for account executives to close. Neither title has a standard definition, so the difference is whatever a company decides it is.

The most common split is by lead source:

• SDR: works inbound leads. People who filled in a form, signed up, requested pricing or downloaded something. The job is speed and qualification.
• BDR: works outbound. Accounts and contacts who haven’t raised their hand. The job is research, targeting and starting conversations from nothing.

Plenty of companies use the titles the other way round, use only one of them for both jobs, or use BDR for partner and channel development. When you compare job posts or salary data across companies, compare the work described, not the title.

For anyone designing the roles, the title matters much less than one question: do inbound and outbound get separate people, separate metrics and separate comp? If they do, the two-title setup is useful. If they don’t, two titles just add confusion.

SDR vs BDR side by side

This table uses the inbound SDR / outbound BDR convention.

	SDR (inbound)	BDR (outbound)
Starting point	A lead that came in	A target account list
Main skill	Fast, accurate qualification	Research, messaging, persistence
Speed matters because	Interest decays quickly after a form fill	Timing is set by the rep, not the buyer
Typical channels	Email reply, phone call-back, chat, scheduling link	Cold call, cold email, LinkedIn, multi-step sequences
Volume driver	Marketing’s lead flow	The rep’s own activity and list quality
Core metrics	Response time, contact rate, qualification rate, meetings held	Accounts worked, conversations, meetings held, opportunities created
Risk if badly managed	Leads sit untouched; bad leads pushed to AEs to hit a number	High activity, low relevance; burned territory
Who the rep depends on	Marketing for volume and lead quality	Ops for list quality and data; AEs for account strategy

The last row is the one that matters for ops. An inbound SDR’s results are largely set by marketing’s lead flow; an outbound BDR’s results are largely set by their own targeting and by the data they’re given. Measuring both with the same quota ignores that.

Why the split exists at all

Inbound and outbound reward different behaviour. A rep who does both will, rationally, favour whichever pays faster. In most teams that’s inbound: the lead is already interested, so a meeting is easier to book. Outbound work gets squeezed into whatever time is left.

Splitting the roles protects outbound from that squeeze and gives each motion its own feedback loop. It also makes the inbound vs outbound sales question measurable: if the people are separate, you can see what each motion actually produces per rep, rather than guessing how a blended rep split their time.

The split costs something, too:

• Smaller teams lose coverage. With two SDRs and two BDRs, one person on leave takes out a quarter of the team and half of one motion.
• Handoff overhead. Inbound leads from target accounts the BDR is already working need a routing rule, or two reps contact the same buyer.
• Career paths diverge. Some reps only learn qualification, others only prospecting. Both skills matter for an AE.

When one role is enough

Our view: a combined role is the better default until either motion is big enough to keep at least two people busy full time on its own. Below that, splitting creates single points of failure and routing rules for very little gain.

Use a single “SDR” (or “BDR”) title and a blended plan when:

• Inbound volume is small or irregular, so a dedicated inbound rep would be idle part of the week.
• The team is small enough that one absence would leave a motion uncovered.
• You don’t yet know which motion works for your market, and want each rep to try both.

If you do run a combined role, protect outbound explicitly: set aside fixed outbound hours in the week, or set a separate outbound target inside the plan. Otherwise inbound absorbs everything.

Split the roles when:

• Inbound response time is suffering because reps are on calls or doing research.
• Outbound results are poor and you can’t tell whether it’s the message, the list or the time spent.
• You want to hire for different profiles: quick, process-driven qualifiers for inbound, and curious, resilient researchers for outbound.

Metrics and comp: where the roles should differ

If the roles are split, their plans should be too.

Inbound SDR

Measure what the rep controls:

• Speed to first touch, measured in working hours from lead creation, with a target written into the plan.
• Contact rate: share of leads reached in a real conversation.
• Qualified meetings held, using a written qualification test.
• Quality check: share of meetings the AE accepts as an opportunity.

Pay mostly on meetings held and accepted opportunities. Don’t pay on lead volume; the SDR doesn’t control it.

Outbound BDR

Measure output, and keep activity metrics as diagnostics rather than targets:

• Meetings held and opportunities created from outbound-sourced accounts.
• Accounts worked to completion: every contact on the account touched through the full sequence.
• Conversations (connected calls, replies) as an early signal of list and message quality.

Pay on meetings held and opportunities, possibly with a bonus on pipeline that later closes. Outbound meetings usually take longer to produce and are harder to book, so a per-meeting rate that’s identical to the inbound rate tends to underpay outbound.

The mechanics of setting variable pay are the same as for any sales role; the OTE guide works through an SDR plan paid per qualified meeting, including why it should pay on meetings held rather than booked.

Handoffs: the part that breaks first

Whatever the titles, write down three rules.

1. Who owns an inbound lead from an account the BDR is already working? Common answer: the BDR keeps it if they’ve had a conversation with that account in a set recent window; otherwise it routes to the SDR. Make the window explicit and make the CRM enforce it.

2. What counts as a handoff to the AE? A booked meeting is not a handoff. A handoff is a held meeting, with the qualification fields filled in, accepted or rejected by the AE within a set time. Rejections need a reason code, or SDRs and BDRs never learn what AEs actually want.

3. What happens to leads that aren’t ready? Inbound leads that aren’t ready to meet need a defined path: back to marketing nurture, or into an outbound BDR sequence later. Without one, they sit in an SDR’s queue until they go stale.

Daily work, illustrated

Illustrative examples of a day, not a prescription:

Inbound SDR: checks the overnight lead queue first thing; calls and emails every new demo request within the response-time target; qualifies by phone using a short checklist (role, company fit, problem, timing); books meetings straight into the AE’s calendar; logs disqualified leads with a reason so marketing can see what isn’t converting.

Outbound BDR: researches a set of target accounts in the morning and picks one trigger per account (a new hire in a relevant role, a product launch, an expansion); runs a cold calling block when buyers are most likely at their desks; sends personalised first-touch emails in the afternoon; updates account status so the AE can see which accounts are in play.

Career path

Both roles usually lead to an AE role, sometimes via a senior or team lead position. Inbound SDRs tend to arrive as AEs strong on qualification and process; outbound BDRs tend to arrive strong on prospecting and resilience. If the company expects AEs to self-source a share of their pipeline, a rotation through outbound before promotion is worth building into the path, even for reps hired into inbound.

Choosing the titles

If you split the roles, pick a convention and apply it everywhere: job posts, the CRM role field, comp plans and reporting. Mixing “SDR” and “BDR” for the same job across teams makes it impossible to compare performance later. If you don’t split, use one title and drop the other.

GTMStack’s SDR Operations reports meetings and outcomes per rep, which makes it straightforward to compare inbound and outbound reps on the measures above once the roles are separated.