The gap between invoice and deposit kills cash flow. Most SMBs sit idle for 45–60 days, watching invoices drift through inboxes and payment systems. Three levers—early-payment discounts, structured payment plans, and automated dunning—can compress that to 25–30 days and recover 40% of the cash you're currently financing yourself. But these levers don't work equally for every business, and the margin trade-off is real. Let's model the math by industry, show which payment rails work where, and tell you which lever to pull first. Lever 1: Early-Payment Discounts (2/10 Net 30) A 2% discount for payment within 10 days sounds small until you calculate the annualized cost. If a client takes 30 days instead of 10, that 2% discount is equivalent to a 36% annual interest rate. Despite the math, it works—particularly for agencies and consulting firms where cash flow is tight and clients have the liquidity to pay early. The mechanics: Invoice states "2/10 Net 30"—2% discount if paid by day 10, full amount due by day 30. You need to honor this in your invoicing and accounting system, not just mention it in a footer. Expected impact: 40–50% of clients take the discount and pay by day 10–12. 30–35% pay by day 20–25, drawn by the discount window even if they miss it. 15–20% ignore the discount and pay on day 30 (or later). That shifts your weighted average payment day from 35 to 20. If you invoice £100k monthly, you're now collecting £65–70k in the first month instead of £35–40k. Margin math: A 2% discount on 50% of revenue is a 1% hit to gross margin. For a consulting firm with 60% gross margins, you drop to 59%—painful but survivable if you're funding growth on unpaid invoices. For a repair shop with 40% margins, a 2% discount cuts into breakeven. Best for: Agencies, consulting, professional services—industries where clients are bigger than you and have accounting systems that flag early-payment opportunities. Worst for: Retail, food, or any business where clients are individuals or micro-businesses without accounting infrastructure to recognize the discount. Lever 2: Split Payment Plans (Staged Collections) Instead of "Net 30," propose "50% on signing, 50% on delivery" or "33/33/34" on specific milestones. This doesn't reduce the time to full payment, but it de-risks cash flow by front-loading collections and forcing a real decision point before you start work. The mechanics: Write the payment schedule into the contract. Generate an invoice for the first tranche immediately; schedule the second and third invoices to generate on delivery or a fixed date. Orin's contract tool can embed payment schedules and trigger invoices automatically ; without it, you're managing spreadsheets. Expected impact: You collect 50% of cash on day 1 instead of day 30. That's a permanent working-capital improvement. Clients are more likely to pay on time if they've already committed; sunk cost psychology works in your favor. You reduce the risk of non-payment—if a project stalls, you've already collected half. On a £10k project, collecting £5k upfront instead of waiting 30 days saves you £5k × 30 days of financing cost. At a 10% cost of capital, that's £41 per month you're not burning. Margin math: No direct margin hit. You're changing the timing, not the price. The risk is that clients push back—larger clients often demand Net 30 or Net 60, and you may lose deals by insisting on staged payments. Best for: Project-based services (repairs, renovations, custom development, design)—any engagement where you incur costs before completion and need cash to fund those costs. Worst for: Recurring billing (SaaS, retainers)—you're already collecting monthly. Consultancies with retainer clients—adding complexity without benefit. Lever 3: Automated Dunning and Payment Reminders Invoices don't disappear into inboxes by accident. They get overlooked, forwarded to the wrong person, or deprioritized. Automated reminders—sent via email, SMS, or WhatsApp—can cut late payments by 15–25% without requiring manual follow-up. The mechanics: Set up a dunning sequence that fires automatically when an invoice reaches day 7, day 14, and day 25 past due. Each message is different and escalates in tone. You can link directly to a payment page, specify payment method options, or include bank details. Best practice: Day 7 reminder is friendly—"Just checking in, invoice #5621 is due soon."; Day 14 is neutral—"Invoice #5621 is now overdue. Please remit payment."; Day 25 is firm—"We need to resolve this. Call us or pay here [link]." WhatsApp reminders outperform email by 3–5x in open rate and conversion. If your clients are in Southeast Asia, Malaysia, or Indonesia, WhatsApp dunning is table stakes. Orin's unified messaging lets you template and automate these across email, SMS, and WhatsApp from one inbox. Expected impact: 15–25% of overdue invoices are paid within 48 hours of the first reminder (usually just an honest "did you forget?"). Another 10–15% settle by day 21 after