SDR vs BDR: The Core Distinction

At most B2B SaaS companies, the titles are used as follows:

  • SDR (Sales Development Representative): Handles inbound leads — prospects who have raised their hand by submitting a demo request, filling out a contact form, or engaging with pricing.
  • BDR (Business Development Representative): Handles outbound prospecting — cold outreach to target accounts with no prior expressed interest.

The distinction matters because inbound and outbound represent fundamentally different motions. An inbound SDR responds to expressed interest; their primary challenge is speed and qualification. An outbound BDR creates interest where none exists; their primary challenge is research, personalization, and persistence.

Many companies use "SDR" as a catch-all title for both. Whether you split them depends on your team size, inbound volume, and whether the two motions require different skill profiles and management approaches.

What an Inbound SDR Does

An inbound SDR's job is to convert warm leads into qualified meetings for the AE team — as fast as possible, with high match quality. Their core responsibilities:

  • Rapid response: First contact with an inbound lead within 5 minutes of submission. Every minute of delay increases the probability the lead doesn't respond.
  • Qualification: Run a short discovery to confirm the lead meets SQL criteria before booking with an AE. This protects AE time from unqualified demos.
  • Routing confirmation: Confirm the right AE is assigned for the meeting. (Note: this should be automated — see below.)
  • Pre-meeting prep support: Ensure the assigned AE has context on the prospect before the meeting.
  • Follow-up on no-shows: Inbound leads who book but don't show should receive a structured 3-touch re-engagement sequence.

For the response time data that defines why SDR speed matters, see our 5-minute rule in sales guide.

What an Outbound BDR Does

An outbound BDR's job is to generate qualified meetings with target accounts who haven't expressed interest. Their core responsibilities:

  • Account research: Identify which accounts to target within the ICP, and which contacts within those accounts are likely buyers.
  • Multi-channel outreach: Email sequences, LinkedIn messages, phone calls, and occasionally direct mail or event-triggered outreach.
  • Personalization: Outbound effectiveness correlates directly with personalization. Generic sequences produce low reply rates.
  • Meeting booking: The primary KPI is meetings booked with qualified prospects.
  • Handoff to AE: Brief the AE on the account context, the prospect's likely concerns, and what triggered their interest in the outreach.

Key Metrics: SDR vs BDR

Metric Inbound SDR Outbound BDR
Primary KPI Qualified meetings booked (from inbound) Qualified meetings booked (from outbound)
Secondary KPI Speed-to-lead, MQL to SQL conversion Sequence reply rate, meeting acceptance rate
Typical monthly quota 15–25 qualified meetings 8–15 qualified meetings
Key efficiency metric % inbound leads contacted within 5 min % sequences with personalized first touch
Show rate target 70–80% 60–70%

When to Split SDR and BDR Roles

The decision to split inbound (SDR) and outbound (BDR) roles depends on three factors:

Volume

If inbound volume is high enough to keep one or more reps fully occupied, split the roles. An SDR spending half their time on outbound is either undertasked on inbound or undertasked on outbound — one motion will get short-changed.

Skill Mismatch

Inbound SDRs need strong qualification skills and fast response habits. Outbound BDRs need research skills, copywriting ability, and persistence in the face of rejection. These are not the same person profile. At scale, you hire for different skills.

Management

Inbound and outbound managers coach different behaviors. An inbound manager focuses on response time, qualification quality, and show rate. An outbound manager focuses on activity, sequence quality, and personalization. If one manager covers both, one motion typically gets neglected.

SDR Routing and Inbound Operations

A critical and often overlooked design decision: SDRs should not make routing decisions. When an inbound lead comes in and the SDR has to figure out which AE to route the meeting to based on territory, segment, and availability — this introduces delay, inconsistency, and human error.

Routing should be automated. The system should determine the right AE assignment based on configured rules (account ownership, territory, deal size) and notify the SDR and AE simultaneously. The SDR's job is to qualify and facilitate the handoff — not to figure out which AE is next in rotation.

Automated routing also eliminates the perception (and reality) of SDRs playing favorites by sending better leads to certain AEs. For the full routing framework, see our guide on MQL routing for B2B SaaS.

Common SDR/BDR Team Structure Mistakes

Combining inbound and outbound with no specialization: Both motions underperform. Inbound response times lag because the rep is working a sequence. Outbound personalization suffers because the rep is monitoring the inbound queue.

No SLA on inbound response time: Without a defined SLA (e.g., first response within 5 minutes), individual reps set their own response time norms. The variance is massive and the average is high.

SDRs doing manual routing: Every minute an SDR spends figuring out which AE to assign is a minute of delay in the handoff — and an opportunity for error or favoritism. Automate the routing logic.

No clear SQL criteria: Without defined SQL criteria, SDRs either over-qualify (holding back qualified leads for more evidence) or under-qualify (booking AE time with leads who aren't ready). Define exactly what makes a lead an SQL and train SDRs to that definition.

Take routing off your SDRs' plates.

Lead Dispatcher automates the routing decision the moment a meeting is booked — so your SDRs focus on qualification, not logistics.

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Frequently Asked Questions

What is the difference between an SDR and a BDR?

An SDR typically handles inbound leads — prospects who've expressed interest. A BDR handles outbound prospecting — cold outreach to target accounts. Many companies use SDR as a catch-all title for both; splitting depends on team size and motion.

Do all companies have both SDRs and BDRs?

No. Many B2B SaaS companies use SDR for both inbound and outbound reps. Splitting the roles makes sense when inbound volume is high enough to keep a dedicated team busy, or when the two motions require different skill profiles and management approaches.

What metrics do SDRs own?

Inbound SDRs typically own speed-to-lead, lead contact rate, qualified meeting rate, and show rate. MQL to SQL conversion rate is a key secondary metric. Pipeline sourced from inbound is the ultimate accountability metric.

What is a typical SDR quota for meeting bookings?

For inbound-focused SDRs at B2B SaaS companies, 15–25 qualified meetings per month is typical. Outbound BDRs typically carry 8–15 meetings per month due to higher effort per meeting generated.

Should SDRs handle routing decisions?

No. Routing should be automated. SDRs should focus on qualification and handoff — not figuring out which AE to assign leads to. Manual routing decisions add delay and inconsistency.