To manage outstanding payments in a water purifier business, agree payment terms in writing before the sale, record every rupee against its invoice, review aged dues every week, and follow a fixed reminder and escalation routine. Done politely and with a written trail, you can recover overdue payment without losing the customer, who may still buy filters, AMC or another unit later.
Note: GST, MSME, income tax and legal points below are general guidance. Confirm them with a CA or lawyer before acting on a specific case.
Why outstanding payments in a water purifier business hurt more than they seem
Your money is already locked in stock, filters, membranes and technician time. Every unpaid invoice adds pressure on working capital.
GST adds to this. Tax is generally payable based on the invoice or supply date, not the date the customer pays, so you may be funding the tax from your own pocket.
Dues usually build up in four places:
- Commercial RO plants, where amounts run from tens of thousands to several lakhs.
- AMC renewals.
- Service parts and filter replacements.
- Instalment or weekly collection sales.
They stay hidden when they live in notebooks, Excel sheets and WhatsApp chats, and nobody has a routine for chasing them.
Step 1: Prevent dues before the sale
Most recovery problems start at the quotation. A customer who never agreed to a due date can hardly be called “late”.
- Take an advance at booking. For commercial installations, many dealers ask for 20-50%. This is your own policy, not a legal rule.
- Print payment terms on the quotation and invoice: due date, accepted modes and late fee, if any. A proper quotation management process makes this routine.
- Get a signed delivery or installation note. A verbal promise is weak evidence if the customer later disputes the bill.
- Never give credit without a written record. Even a signed acknowledgement of the amount helps.
Step 2: Invoice correctly and record every payment
Issue the GST invoice at delivery or installation. Most small dealers fall below the e-invoicing turnover threshold, but check the current limit with your CA.
Then record each payment (cash, UPI, cheque, part-payment) against the specific invoice. Without this, you cannot answer “how much does this customer owe?” in ten seconds, and the customer can argue the figure. Write the invoice number on the back of every cheque. Keep AMC renewal dues separate from product sale dues, as they run on different cycles.
Stop technician cash leakage
- Use a numbered receipt book or digital receipts, and give one every time.
- Record the amount the same day and ask the technician to deposit it within a fixed time.
- Prefer your own UPI QR over a technician’s personal number.
- Match collections to invoices at the end of each day.
Step 3: Age your dues and review them every week
Ageing means grouping dues by how long they are overdue: 0-7, 8-30, 31-60 and 60+ days. It shows which accounts need a call today and which can wait. Hold a 15-minute weekly review and give each overdue account to one named person.
Worked example: apartment RO plant (illustrative)
Say a dealer in Coimbatore installs a ₹3,00,000 RO plant for an apartment association. The agreed milestones are below. The figures are made up for illustration and are inclusive of GST.
| Milestone | Amount | Due date | Status on 20 Nov |
|---|---|---|---|
| Advance at booking (40%) | ₹1,20,000 | At booking | Paid |
| On delivery (40%) | ₹1,20,000 | 12 Oct | ₹80,000 paid, ₹40,000 pending (39 days overdue) |
| On commissioning (20%) | ₹60,000 | 1 Nov | Pending (19 days overdue) |
Total outstanding is ₹1,00,000. In the ageing view, ₹40,000 sits in the 31-60 bucket and ₹60,000 in the 8-30 bucket. The owner sees at the weekly review that the older balance needs a senior call and a written reminder to the association treasurer, not just the secretary who placed the order. Without ageing, both would look like “pending” in a notebook.
If you run several branches or franchises, view dues by branch as well as by customer. Watch for repeat late payers, large commercial accounts and AMC customers who keep postponing.
Step 4: Send a payment reminder on a fixed schedule
A fixed schedule removes awkwardness. The reminder becomes routine, not personal.
| When | Action |
|---|---|
| 2 days before due date | Friendly reminder with payment link |
| Due date | Reminder with UPI QR |
| 3 days after | Polite follow-up message |
| 7 days after | Phone call, agree a payment date |
| 15 days after | Call or visit by owner or senior staff, then a written notice if needed |
Ready-to-use templates
Due date (English): “Hello [Name], a gentle reminder that invoice #[No.] for ₹[amount] is due today. You can pay by UPI: [link]. Thank you.”
Due date (Tamil-English): “வணக்கம் [Name], உங்கள் invoice #[No.] ₹[amount] இன்று due. இந்த UPI link மூலம் pay பண்ணலாம்: [link]. நன்றி.”
3 days after (English): “Hello [Name], invoice #[No.] for ₹[amount] is still pending. Could you please pay today? [link]. If there is any issue, do let us know.”
3 days after (Tamil-English): “வணக்கம் [Name], invoice #[No.] ₹[amount] இன்னும் pending-ஆ இருக்கு. இன்று pay பண்ண முடிந்தால் உதவியா இருக்கும்: [link]. ஏதாவது சிரமம் இருந்தால் சொல்லுங்க. நன்றி.”
7 days after (English): “Hello [Name], invoice #[No.] for ₹[amount] is now 7 days overdue. Please share the date by which you will pay, so we can note it.”
7 days after (Tamil-English): “வணக்கம் [Name], invoice #[No.] ₹[amount] 7 நாட்களுக்கு மேல் overdue. எந்த date-க்குள் pay பண்ணுவீங்கன்னு சொன்னா நாங்க note பண்ணிக்கிறோம். நன்றி.”
15 days after (English): “Hello [Name], invoice #[No.] for ₹[amount] has been pending for 15 days. We would like to speak to you about it. When can we call?”
15 days after (Tamil-English): “வணக்கம் [Name], invoice #[No.] ₹[amount] 15 நாட்களாக pending. இது பற்றி பேச விரும்புகிறோம். எப்போது call பண்ணலாம்? நன்றி.”
UPI is free for customers, so a QR or link makes same-day payment easy. WhatsApp Business API needs approved templates and customer opt-in, and pricing varies, so check current rates. For large accounts, a call still matters more than any message.
Tamil Nadu timing tips
Cash often gets tight around Diwali, Pongal and school-fee season. Where possible, collect before the festival rush and avoid chasing on festival days. In busy summer months, follow-ups tend to slip because teams are on installations, so the weekly review matters even more. These are general observations, not data.
Step 5: Recover overdue payment step by step
Follow a ladder: reminder, call, owner or senior visit, written notice, and for B2B accounts, a legal notice. Do not jump steps unless the customer clearly refuses to pay.
Many dealers pause free service or AMC visits while dues are pending. State this upfront in the quotation, invoice or AMC terms so customers are not surprised. Log every call, visit and message with date and outcome. Stay firm but respectful.
Handling B2B customers: apartments, schools, hospitals, hotels and offices
- Agree milestones before installation, such as advance, on delivery and on commissioning, as in the example above.
- MSMED Act: if you are registered on Udyam, buyers must pay within the agreed period, not beyond 45 days (15 days if there is no written agreement). Delayed payment attracts compound interest at three times the RBI bank rate, with monthly rests. It does not apply to retail customers.
- Section 43B(h), Income Tax Act (from FY 2023-24): a business buyer’s tax deduction for payments to MSME suppliers depends on paying within those time limits. Mention this politely to accounts teams. Verify the details with a CA.
- Contact the accounts or purchase department, not just the person who placed the order.
What to do about a bounced cheque
Keep the cheque copy, the bank return memo and the invoice. Under Section 138 of the NI Act, the cheque must have been presented within its validity period (currently three months from its date; confirm). The usual sequence is:
- Send a written legal notice within 30 days of receiving the bank’s return memo.
- The drawer then has 15 days from receiving the notice to pay.
- If unpaid, the complaint can be filed within one month after that 15-day period ends.
Missing these windows can weaken your case, so involve a lawyer early. Where the relationship is worth keeping, try a call, re-presentation or UPI payment first. For instalments, prefer UPI, bank transfer or post-dated cheques linked to an invoice.
Collecting AMC dues and instalments
- Instalments and weekly collections: treat each instalment as its own due with a date, so a missed week shows up immediately instead of hiding in a running total.
- Post-dated cheques or UPI AutoPay: the customer must consent, limits vary and pre-debit notification rules apply. Check current RBI rules.
- AMC renewals: send the reminder before expiry with the payment option. Domestic AMCs often cost roughly ₹1,500-₹4,000 a year depending on coverage, which is approximate, not a standard price. See our guide to tracking AMC renewals.
- After lapse: do not continue free service once the AMC has lapsed or payment is pending, unless you choose to.
What if the invoice is never paid? GST and write-offs
GST on an invoice is generally payable even if the customer never pays. Whether you can reverse it for a true bad debt is uncertain. A credit note under Section 34 has conditions, so a write-off does not simply reverse the GST. Income Tax relief may be possible. Ask your CA before writing off any large amount.
Common mistakes to avoid
- Tracking dues only in notebooks or Excel, with no ageing view.
- Chasing only when cash is short.
- Giving credit without written acceptance.
- Letting technicians collect cash without receipts or deposit it late.
- Believing GST is due only when the customer pays.
- Believing the MSME 45-day rule covers retail customers.
- Continuing free service for non-paying customers.
How a CRM like Nixie can help you follow this process
Nixie CRM by Shiny Software Services keeps sales, service and dues in one place instead of notebooks and chat threads. It supports customer records with outstanding balances, quotation and payment follow-up tracking, GST invoice generation, AMC and service tracking, and WhatsApp API reminders. That maps to Steps 1 to 4 above. Our guide on managing customer follow-ups covers the follow-up side in more detail.
Start your 7-day free trial at https://app.nixie.in, or explore the product at https://nixie.in.
Quick checklist for dealers
- Advance at booking
- Written payment terms
- Signed delivery or installation note
- GST invoice at delivery
- Every payment recorded against its invoice, with same-day receipts
- Dues aged into buckets
- Fixed reminders at -2, 0, +3, +7 and +15 days
- Step-by-step escalation
- Weekly review with a named owner for each account
FAQ
How do I recover money from a water purifier customer who is not picking up calls?
Send a WhatsApp message with the invoice and payment link, then call at different times of day. If there is still no response, send a senior person to visit, then a written notice. Log every attempt, and for B2B accounts, write to the accounts department as well.
Can I stop AMC or free service if the customer has not paid?
Many dealers do. State this in the quotation, invoice or AMC terms beforehand so it is not a surprise. Resume service once dues are cleared.
Do I have to pay GST on an invoice the customer has not paid yet?
Generally yes, because GST depends on the invoice or supply date, not on payment. If the invoice is never paid, GST relief is uncertain, so consult your CA.
What should I do if a customer’s cheque bounces?
Keep the cheque, return memo and invoice, and contact the customer first. If needed, send a legal notice within 30 days of the memo, allow 15 days for payment, and file within one month after that. Confirm timelines with a lawyer.
Does the MSME 45-day payment rule apply to retail water purifier customers?
No. It covers payments from business buyers to Udyam-registered micro and small suppliers. A household buying a purifier is not covered.
How can I send polite payment reminders on WhatsApp in Tamil and English?
Use a short template with the customer’s name, invoice number, amount, due date and a UPI link, as in the samples above. Make the tone firmer at each stage. For automated sending, WhatsApp API needs approved templates and customer opt-in.