THE HUNT PAYMENT LIBRARY
100 questions.
About getting paid.
Practical answers about unpaid invoices, lawful recovery, reminders, client relationships and AI. Written for the people doing the work on both sides of a B2B payment.
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100 questions across 10 topics.
01Getting paid legally
Practical answers on invoice evidence, lawful demands, late fees, collection conduct and local legal routes for agencies and B2B service firms.
- What evidence should I collect before pursuing an unpaid service invoice?
- Can I recover an unpaid invoice if we never signed a contract?
- How do I word a firm payment request without making empty legal threats?
- Can I add interest or a late-payment fee to a B2B invoice?
- Do US consumer debt-collection rules apply to unpaid business invoices?
- How often can I legally contact a business about an unpaid invoice?
- Where can an Indian service business raise an eligible MSME delayed-payment claim?
- Should I publicly name a client or contact their employees to pressure payment?
- When should a service firm consider a court claim for an unpaid invoice?
- Can an unpaid invoice become too old to sue over?
02Cross-border invoice payments
Understand cross-border invoice terms, currency deductions, EU remedies, India and Singapore limits, arbitration and enforcement before escalating.
- Which country’s law applies when an overseas client does not pay?
- What should I confirm before invoicing an international business client?
- Who pays bank charges or exchange-rate differences on an international invoice?
- What should I do if an overseas client deducts tax from my invoice?
- Can I charge an overseas EU client statutory interest and recovery compensation?
- Can the European Small Claims Procedure help recover a service invoice?
- Can an Indian MSME use the delayed-payment council route against an overseas company?
- Can I use Singapore’s Small Claims Tribunals for an unpaid service invoice?
- Is arbitration a good way to recover an international invoice?
- Will winning a court case abroad guarantee that my invoice gets paid?
03Payment reminder emails: what to say, when to send and when to stop
Ten practical answers about payment reminder contents, subject lines, timing, tone, accessibility and confirming payment without damaging client relationships.
- What should a professional payment reminder email include?
- What is a useful subject line for an overdue invoice email?
- How can I ask for payment firmly without sounding rude?
- Should I send a reminder before an invoice is due?
- How often should I follow up on an unpaid invoice?
- What should I do when a client ignores payment reminder emails?
- Who should receive the reminder, and when should I copy the client’s manager?
- How should I reply when the customer says they have already paid?
- How should reminders change for clients in another country or time zone?
- How do I make a payment reminder easy to read and accessible?
04Inside the payment process: what happens on both sides of an invoice
Understand invoice intake, purchase orders, approvals, payment runs, disputes and cash constraints, with questions that identify the person who can unblock payment.
- What happens inside a customer’s company after I send an invoice?
- Why can accounts payable say they cannot approve my invoice?
- What is invoice matching, and why can a purchase order block payment?
- Why does the client still need approval when we already delivered the work?
- Can incomplete supplier onboarding stop an otherwise correct invoice?
- Why is an approved invoice still unpaid?
- What should I ask when the client says we missed the payment run?
- How can a profitable customer still struggle to pay an invoice?
- Why can an invoice be rejected as a duplicate when we still have not been paid?
- What should our team record so sales and finance do not send conflicting chases?
05Invoice disputes and payment plans
Resolve disputed service invoices, negotiate realistic instalments, document settlements and recognise when insolvency or contract advice is needed.
- What should I do first when a client disputes an invoice?
- Can a client refuse payment because they are unhappy with the results?
- Can I ask a client to pay the undisputed part while we resolve the rest?
- Should I offer a payment plan or a discount to recover an overdue invoice?
- What should a written invoice payment plan include?
- What should I do when a client misses an agreed instalment?
- Is accepting a partial payment the same as accepting a full and final settlement?
- When is mediation useful for an unpaid service invoice?
- What happens to my unpaid invoice if the client becomes insolvent?
- Can I stop work or withhold deliverables when a client does not pay?
06The psychology of late payment
Understand silence, financial stress, shame and pressure in late-payment conversations, with research-informed ways to stay firm and protect client trust.
- Why does a happy client go silent when an invoice is due?
- Why can an aggressive payment reminder backfire?
- Can embarrassment make someone avoid a payment conversation?
- How can financial stress affect payment decisions?
- How do I stop anger or anxiety from controlling my follow-up?
- Why can both parties think their payment position is fair?
- Does giving a client a choice help a payment conversation?
- Should collecting an invoice be treated as psychological warfare?
- Should payment-reminder tone change across countries and cultures?
- Is a pause useful during a difficult payment call?
07Payment negotiation and client relationships
Prepare difficult payment conversations, handle promises and disputes, and agree clear next steps with research-informed negotiation guidance for service firms.
- How should I prepare for a difficult payment conversation?
- How can I distinguish a client who cannot pay from one who will not?
- Can I acknowledge a client's difficulty without agreeing to late payment?
- How can I discuss a late payment without immediately offering a discount?
- How do I discuss an invoice dispute without turning it into a personal argument?
- When is a phone call better than another payment email?
- What should I say when a client misses a promised payment date?
- How do I respond when a client says chasing payment damages our relationship?
- How should I repair trust after sending an incorrect payment reminder?
- When should I stop informal payment negotiations with a client?
08Preventing late payments before the first reminder
Practical answers on client onboarding, invoice accuracy, deposits, scope changes, retainers, discounts, payment fraud and reducing exposure to late receipts.
- What should we agree with a new client before starting work?
- Which invoice errors should we catch before sending?
- What checks are reasonable before offering a new client payment terms?
- When do deposits or milestone invoices make sense for service businesses?
- How can scope changes turn into late-payment disputes?
- How should an agency set up monthly retainer billing to avoid confusion?
- Should we offer an early-payment discount to get paid faster?
- How can we prevent fake bank-detail changes from diverting invoice payments?
- How do we measure whether our late-payment prevention process is working?
- How do we stop one late client payment from disrupting payroll or delivery?
09AI invoice personas: where they help and how to choose
Evaluate AI invoice personas against simple reminders and human follow-up, with research limits, a pilot checklist and truthful HUNT availability.
- What is an AI invoice persona, beyond a reminder template?
- When could an AI persona be a better option than fixed email reminders?
- Which invoice conversations should stay with a person?
- Do studies prove that AI personas make clients pay faster?
- Why give the assistant a consistent name and voice?
- What should I compare when evaluating AI invoice follow-up products?
- Can AI personalize a reminder without becoming manipulative?
- How should an AI follow-up schedule react to a payment or a promise?
- How do I know whether an AI persona pilot is actually working?
- What can I try in HUNT today, and what is still being developed?
10AI follow-up controls: facts, approvals and customer data
Ten practical questions about AI invoice accuracy, prompt injection, approvals, privacy, audit records, international use and stopping a failed workflow.
- How do I prevent an AI assistant from inventing an amount or due date?
- Could an invoice attachment or client reply manipulate the AI’s instructions?
- How can we test that AI cannot change payment instructions without approval?
- Which actions should require explicit human approval?
- How should pause and resume controls work when someone disputes or pays an invoice?
- What customer data questions should we ask before using an AI invoice tool?
- Can one AI persona safely handle different languages and legal jurisdictions?
- What should an audit trail retain for an AI-assisted payment conversation?
- How can we detect unfair or excessively aggressive AI follow-ups?
- What should we do if an AI assistant sends a wrong reminder?
Evidence with its context attached.
Sources are linked beside the answers they support, with notes on jurisdiction, research populations and limits. A study about customer support, consumer debt or a particular group of businesses does not establish what will happen to your invoice.
- McKinsey: working-capital processes and technology
- JPMorgan Chase Institute: small-business cash buffers
- MIT Sloan: where AI helps and where it falls short
- Stanford: evidence on email negotiations
HUNT publishes these answers with AI assistance. Examples are fictional, and cited institutions do not endorse HUNT. Read our editorial standards or send a correction.
For longer workflows and worked calculations, explore the HUNT blog.
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