The £5K Minimum
If you're a B2B SaaS company considering LinkedIn ads, £5K per month is the floor. Below that, you can't run a proper full-funnel strategy — you'll either have enough budget for nurture but nothing for conversion, or enough for a few conversion ads but no content to warm the audience first.
At £5K, you can target a focused account list of 1,000–2,000 companies, deliver thought leader ads at the 5×5 minimum (five pieces of content, five impressions each), and run bottom-of-funnel conversation ads and lead gen forms to capture demand. It's tight, but it works — especially when paired with outbound.
The Budget Math
Here's how the numbers work for a typical B2B SaaS account:
That's the math for a 4,000-person audience (1,000 companies × 4 job titles). Smaller audiences need less budget. Larger audiences need more. The formula stays the same — the variable is your list size.
Option A: build your ideal account list first, then calculate the budget needed to hit 5×5. Option B: set your budget first, then build a list sized to match. Either works. The important thing is that list size and budget are aligned — too big a list for the budget means poor penetration, too small a list means wasted spend.
Budget Tiers and What They Buy
- £5K/month: Focused ABM on 1,000–2,000 companies. Enough for TL ad nurture at 5×5 plus basic conversation ads. Tight but effective, especially when paired with outbound.
- £10–15K/month: The sweet spot for most B2B SaaS companies. Full-funnel coverage on 2,000–4,000 companies. Strong nurture, consistent conversion ad volume, room for testing. This is where you start seeing predictable SQL flow.
- £15–25K/month: Full-funnel at scale. 3,000–5,000+ companies. Multiple content streams, aggressive conversation ads, retargeting layers, and enough data to optimise fast. Accounts at this level are generating 20–60+ SQLs per month.
- £25K+/month: Enterprise-scale ABM. Large target lists, multiple segments, layered retargeting, and full demand capture. One account at $25K generated 66 SQLs from conversation ads alone. Another generated $5.9M pipeline from $60K total spend.
The "Budget First" Approach
If your budget is fixed — say, £8K per month — work backwards. At $60 CPM and 25 impressions per person needed, your nurture budget of ~£5K covers approximately 3,300 reachable people per month, which means a target audience of about 5,900 (accounting for the 56% reachability factor). That's roughly 1,500 companies at 4 job titles each.
Build your account list to 1,500 companies. Segment by signals. Deliver 5 pieces of content at 5× frequency. Use the remaining £3K for conversation ads and lead gen forms. Match the list to the budget and you'll hit all the benchmarks.
The budget figures above are for LinkedIn ads alone. When you layer outbound on top — signal-based, warm outbound, website visitor outbound — the pipeline impact per pound spent increases dramatically. LinkedIn ads generate the awareness and engagement signals. Outbound converts those signals into meetings. A £5K LinkedIn ads budget with a well-built outbound system can outperform a £25K LinkedIn-only strategy that ignores outbound entirely.