SDR vs BDR: What’s the Difference and Which Does Your Business Need?
If you’ve posted a sales job recently or tried to build a pipeline team, you’ve probably wondered: should I hire an SDR or a BDR? The titles are often used interchangeably, but they represent different functions — and hiring the wrong one for your stage is an expensive mistake.
An SDR focuses on inbound lead qualification. Their job is to respond to leads that have already expressed interest — a demo request, a content download, a trial signup — and convert that interest into a booked meeting for an Account Executive.
SDRs are reactive by nature. They work the top of the funnel after marketing has done its job.
A BDR focuses on outbound prospecting. They don’t wait for leads to come in — they go out and create pipeline from scratch. Cold email, cold calling, LinkedIn outreach, and event networking all fall under the BDR’s toolkit.
BDRs are hunters. They generate pipeline from accounts that have never heard of your company.
| SDR | BDR |
|---|---|
| Inbound leads | Outbound prospecting |
| Marketing-generated leads | Self-sourced leads |
| Qualification & follow-up | Cold outreach |
| Lead response time, MQL → SQL rate | Emails sent, calls made, meetings booked |
| Best for companies with inbound traffic | Best for companies building pipeline from scratch |
Both roles suffer from high attrition. Industry data consistently shows SDRs and BDRs have some of the highest turnover in B2B sales.
Replacing one costs an average of 1.5x their annual salary when you factor in recruiting, onboarding, ramp time, and lost pipeline.
Many companies are solving this by hiring remote SDRs and BDRs through specialist agencies. You get vetted, trained reps without the management overhead or replacement risk.
Kology offers both Hire SDR and Hire BDR services — remote reps who are already trained in multi-channel outbound and can start generating pipeline in weeks, not months.
The SDR/BDR distinction matters because they require different skills, different metrics, and different support structures.
Conflating the two leads to misaligned expectations and underperformance. Get clear on which problem you’re actually solving before you hire.
An SDR (Sales Development Representative) primarily handles inbound lead qualification — following up with prospects who’ve already shown interest.
A BDR (Business Development Representative) focuses on outbound prospecting — cold outreach to net-new accounts.
SDRs are reactive; BDRs are proactive hunters.
BDRs often earn slightly more due to the complexity and difficulty of outbound prospecting.
In the US, SDR base salaries average $45,000–$60,000 while BDR base salaries range from $50,000–$70,000.
Both roles carry variable commission tied to meetings booked or opportunities created.
Technically yes, but it’s not ideal.
Inbound and outbound require different mindsets, workflows, and time allocation.
Combining both roles leads to one consistently being deprioritised — usually outbound.
Separating the functions produces better results at scale.
SDRs are measured on lead response time, MQL-to-SQL conversion rate, and meetings booked from inbound leads.
BDRs are measured on outbound activities (emails sent, calls made), positive reply rates, and net-new meetings booked.
Both ultimately feed into pipeline created and revenue influenced.
Most early-stage startups with limited inbound should hire a BDR first.
Without significant inbound traffic, there’s nothing for an SDR to qualify.
A BDR can build pipeline from scratch, validate the ICP, and generate initial revenue — all while helping you learn what messaging resonates before you scale.
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