TL;DR. An in-house junior SDR in Flanders costs roughly €55,000 fully loaded per year — for the first 12 months that's €4,583 per month with three months of unproductive ramp. For the same budget you get a full specialist team from week 2. Outsourcing wins on price and speed in almost every scenario — except three specific exceptions you'll find below.
Every Flemish SME owner who says "we should hire a salesperson" does a mental math. Usually it's: "€35k gross × 1.3 for RSZ social charges = roughly €45k. We can handle that."
That math is wrong. And it's structurally wrong in six places.
This article does the full calculation. Including everything owners typically forget: workspace, tools, recruiting, ramp-up productivity, departure risk, and the hidden cost of management time.
Then we compare it to outsourcing. And we finish with the three scenarios where hiring actually is the right call.
The real cost of an in-house junior SDR in Flanders
Start with gross salary. A junior SDR (0–2 years of experience) in Flanders earns between €35,000 and €42,000 gross per year in 2026. We'll use €38,000 as a realistic average.
On top of that:
| Item | Annual | Note | |---|---|---| | Gross salary | €38,000 | Base | | Employer RSZ contribution (~25%) | €9,500 | Belgian standard for white-collar | | Holiday pay + year-end bonus | €3,800 | 13th month equivalent | | Meal vouchers | €1,600 | Near-standard in Flemish B2B | | Hospitalization insurance | €600 | Basic plan | | Group insurance | €1,300 | Statutorily recommended from junior level | | Mobile + plan | €600 | | | Laptop (amortized over 3 years) | €500 | | | CRM + Sales Navigator + dialer + enrichment tools | €2,400 | Typical minimum stack | | Recruiting cost (amortized year 1) | €5,500 | Average recruiter fee for sales, or internal HR time | | Training + onboarding (internal) | €2,200 | 40 hours of manager time × owner hourly cost | | Year 1 total (fully loaded) | €66,000 | |
Rounded: €55,000–€66,000 per year is the realistic range for a Flemish junior SDR, first year included. Monthly: €4,583–€5,500.
What that SDR actually produces in year 1
Here's where it gets painful. A junior SDR in Flanders typically has:
- Months 1–3: productivity ≈ 0. Onboarding, learning product, learning ICP, writing first scripts, making first 200 calls with hand-holding. Meeting ratio in this window is often 1 per 200+.
- Months 4–6: productivity 40–60%. Script starts working, objections become familiar, but volume is still low.
- Months 7–12: productivity 70–90%. Stabilization. This is where real return starts.
Over the first year you average 55–70% of the final quota. That means: you pay €55–66k for what's effectively 6–8 months of productive output.
And then there's departure risk.
The departure risk nobody models
Flemish sales roles see an average retention of 18–24 months for junior profiles. 30% of junior SDRs leave within 12 months.
If that happens, you pay:
- Severance (statutory minimum for white-collar with <1 year tenure: 1 week per started trimester, so 1–4 weeks) = €730–€2,900
- Re-recruitment = another €5,500
- Another ramp-up = another 3 months of productivity loss
- Loss of accumulated knowledge — unmeasurable but real
Effective first-year cost if they leave in month 9: easily €75,000+ for fewer than 5 months of productive output.
The outsourcing math
At Salesflow, bundles start as follows:
| Bundle | Monthly | What you get | |---|---|---| | Ignite | €1,450 | 50 calls + 50 leads + onboarding playbook | | Accelerate (most popular) | €4,900 | 300 calls + 150 leads + SDR Core + coaching | | Apex | €9,800 | 1,000+ calls + leads included + dedicated AE + fractional VP Sales |
Take Accelerate as a direct comparison to an in-house SDR. €4,900 per month, delivery from week 2, no RSZ, no recruiting cost, no three-month ramp. You can scale down after 3 months if it doesn't work — total exposure: €14,700.
For comparison: hiring an in-house SDR and letting them leave after 6 months costs you roughly €38,000 all-in (6 months fully-loaded salary + severance + re-recruiting). For demonstrably less output.
The comparison table
| Dimension | In-house junior SDR | Salesflow Accelerate | |---|---|---| | Monthly cost (fully loaded) | €4,583–€5,500 | €4,900 | | Recruiting time | 6–12 weeks | 0 | | Ramp-up | 3 months unproductive | 2 weeks | | Working from week | 14–16 | 2 | | RSZ social charges | Yes | No | | Holiday/sick | ~30 days/year unproductive | Continuity guaranteed | | Leads included | No (+€500–€1,500/mo) | Yes (150/month) | | Coaching | No (+€1,500/mo) | Included | | Call recording + QA | No (+€200/mo) | Included | | Departure risk | High | Swap the specialist | | Notice period | Statutory | 1 month | | Meetings in month 1 | 0 | 5–8 | | Meetings in month 3 | 3–5 | 12–18 | | Meetings in month 6 | 8–12 | 12–18 |
The math: outsourcing wins on almost every dimension over the first 12 months. Only past month 18–24 can a well-ramped internal SDR start to be cost-competitive — and even then often only on a per-call basis, not on total output.
Three scenarios where hiring actually is the right call
We sell outsourcing. That's why we also tell you when it doesn't fit. Three scenarios where an in-house hire beats us:
1. Your sales is purely relationship-driven and happens at events
If your business comes 80%+ from personal networks, trade shows, and events, you need someone who physically travels with you and represents your team in long relationship-building. No outbound agency replaces that.
2. You have sustained high volume and a proprietary IP advantage
If you know for certain you'll run heavy volume for 24+ months, and you have an internal process you'd rather not share with a third party, an in-house SDR team can be marginally cheaper long-term. But: 90% of SMEs who think they have that certainty don't.
3. You already have a sales manager who can coach
The reason 60% of first Flemish junior SDR hires fail: there's nobody to coach them. If your owner or commercial director commits 6 hours a week to coaching a junior, an in-house hire sometimes works. Without that investment — almost never.
When hybrid works
The most powerful setup for Flemish SMEs of 15–50 FTE is often hybrid: outsourced top-of-funnel volume, plus one internal commercial rep who closes and gets coached by the external team.
Hybrid cost structure:
- Outsourced (Accelerate tier): €4,900/month
- Internal closer (mid-senior, €55k gross): €6,800/month fully loaded
- Total: €11,700/month for a full engine that fills the top and closes the bottom
That's roughly what you'd pay for two internal hires (one of whom still has 6 months of ramp ahead). The difference: the engine runs from week 2.
More on the hybrid approach on our Accelerate page.
FAQ
What does a Flemish junior SDR really cost per year? Between €55,000 and €66,000 fully loaded for year 1 (including recruiting, onboarding, tools). Monthly equivalent: €4,583–€5,500.
How long is ramp-up? Junior SDR: 3 months for break-even productivity, 6 months for full production. Mid-senior SDR (3+ years of experience): 6–8 weeks. Outsourced specialist: 2 weeks.
What's the average departure risk? 30% of junior SDRs in Flanders leave within 12 months. That rises to 45% if there's no internal coach.
Can I use KMO-portefeuille for outsourcing? For the coaching and training components of our services: yes, if you're registered as a KMO and we're a recognized provider. For pure execution (calls, leads): no, that doesn't qualify as training.
How do I start if I want to try it myself? Start with a 3-month outsourcing pilot to test what works in your market, build the playbook with the external partner, and only then recruit internally if volume justifies it. Your hiring risk drops 70%.
Ready to move?
We're happy to do the math for your specific situation. Free 45-minute audit: we look at your current sales cost, your volume, your market, and we give you a clean comparison between hiring and outsourcing — even if the answer is that hiring is smarter for you.