Outsourced AP: the signals it's time to bring it in-house

Outsourced accounts payable is one of the highest-leverage finance decisions a growth-stage company makes. Done well, it removes invoice processing, vendor reconciliation, payment runs, and TDS deductions from the founder's calendar at a fraction of the cost of in-house staff. We run AP for a number of companies in the Rs. 10 to 80 crore revenue band, and the engagements typically run for 24 to 36 months before the conversation about bringing it in-house starts.

The question we get most often from founders is not 'should we outsource AP' (the answer for most companies in that revenue band is yes) but 'when do we stop outsourcing'. The answer is not a revenue threshold. It is a set of operational signals, any one of which can land before the company has crossed Rs. 100 crore, and any one of which means the AP function needs to come back in-house — sometimes fully, sometimes partially.

Signal 1: supplier volume crosses 500 invoices per month

An outsourced AP team can comfortably handle 100 to 400 supplier invoices a month for a single client. At 500-plus, the economics start to flip. The team needs daily presence in the client's ERP, daily reconciliation against goods-received reports, and faster supplier query turnaround than a remote team can deliver.

We track invoice volume by month and quarter for every AP client. When the trailing-three-month average crosses 450, we have the conversation with the client about a hybrid model: in-house AP executive doing invoice entry and GRN matching, outsourced team handling the controls layer (controller review, TDS verification, payment authorisation, vendor master maintenance). At 700-plus, the conversation shifts to full in-house.

The breakpoint is not arbitrary. Below 400 invoices, one outsourced executive can serve two to three clients. Above 500, you start to need a dedicated person, at which point you are paying the outsourced premium for what is effectively a dedicated hire.

Signal 2: GST input credit complexity has outgrown standard reconciliation

Every company doing more than Rs. 10 crore of revenue runs into GST input credit issues. For most, the issues are routine: an invoice missing from GSTR-2B, a vendor with a wrong GSTIN, a credit note not adjusted. An outsourced AP team handles these in stride.

The signal that something has shifted is when input credit reconciliation has become a multi-day exercise involving multiple states, reverse charge mechanism (RCM) on a long list of services, ITC restrictions under Section 17(5) on motor vehicles and food, blocked credit re-evaluations on capex, and the new Section 16(2)(aa) restriction requiring GSTR-2B as the only valid basis for ITC. Once the input credit conversation requires the controller and the GST partner to be in the same room every month, the AP function needs someone in-house who lives in the ITC reconciliation full-time.

The pattern we see: a D2C brand with warehouses in 6 states, supplier invoices coming in across 15 GSTINs, monthly ITC reconciliation requiring 4 to 6 person-days, and disputed input credit balances above Rs. 30 lakh in any given month. That company needs an in-house GST and AP analyst, not an outsourced shared service.

Signal 3: multi-entity consolidation has become a bottleneck

A single-entity company runs AP through one set of books, one set of vendor masters, one set of GST registrations. A holding company with two or three operating subsidiaries — common in companies that have set up separate entities for marketplace operations, exports, or new business lines — runs AP through three sets of books, with intercompany expense allocations and reimbursements layered on top.

When the intercompany AP layer requires monthly netting calculations, transfer pricing documentation under Sections 92A to 92F, and consolidated payment runs across entities, an outsourced provider doing standard AP cannot keep up. The signal is when the intercompany AP work is taking more time than the third-party AP work. At that point, in-house AP with controller-level oversight makes more sense than continuing to layer outsourced complexity.

Signal 4: an audit finding on AP controls

The most direct signal is when the statutory or internal auditor raises a finding on AP controls. Common findings: no segregation of duties between invoice entry and payment authorisation; payments going to bank accounts not matched against the vendor master; TDS deducted at the wrong rate or under the wrong section; GST reverse charge not applied on imports of services under Section 5(3) of the IGST Act.

An outsourced AP team can fix the symptom but cannot always fix the structure. The structural fixes — separating maker and checker roles, locking down the vendor master, building automated controls into the ERP, documenting the AP policy with sign-off matrices — require the company to own the function. Auditors are increasingly explicit that AP run end-to-end by an external provider has weaker controls by definition than AP run by an in-house team with external supervision.

This signal is the one we flag to clients as non-negotiable. When the auditor's management letter calls out AP controls, the conversation about in-house AP is no longer optional.

Signal 5: supplier disputes are increasing

Healthy AP runs at near-zero supplier disputes. A few invoices each month require a query, the query gets resolved in 24 to 48 hours, payment goes out on schedule. When supplier disputes start to compound — invoices unpaid past 90 days because the GRN is missing, suppliers calling the founder directly because the AP team is not responsive, credit notes not getting processed, payment terms quietly being broken — the AP function has lost the trust of the supplier base.

Outsourced AP can rebuild this trust, but only with a heavy operational lift and a clear escalation path. If the dispute volume keeps rising despite the lift, the issue is structural: the company needs someone whose full-time job is supplier relationship management and AP query resolution, sitting close to the operations team. That role does not outsource well.

The cost comparison

For a company processing 200 invoices a month with two GST registrations and standard TDS complexity, outsourced AP costs Rs. 40,000 to Rs. 60,000 per month, or roughly Rs. 6 lakh per year. The scope includes invoice entry, GRN matching, TDS deduction, GST input credit tracking, vendor master maintenance, monthly payment runs, and standard reporting.

An in-house AP executive at the same scope costs Rs. 4 to 5 lakh per year in salary, plus Rs. 30,000 to Rs. 60,000 in tools (Tally or Zoho add-ons, OCR for invoice scanning, vendor portal), plus the management overhead of supervising the role. All-in, Rs. 5 to 6 lakh per year.

The break-even point sits around 400 invoices per month. Below 400, outsourced is cheaper because the in-house executive is underutilised. Above 400, the in-house executive is fully loaded and the per-invoice cost drops. Above 600, you typically need two in-house executives, and the cost flips back in favour of outsourced for the lower-complexity volume — which is why the hybrid model we run for several clients sits well above pure outsourced or pure in-house.

The transition itself

When the signals say it is time, the in-house transition takes 8 to 12 weeks. The first 4 weeks are hiring and onboarding: AP executive joins, shadows the outsourced team, takes over invoice entry. The next 4 weeks are dual-running: in-house executive runs the AP cycle, outsourced team reviews and corrects. The final 2 to 4 weeks are the handover: vendor master ownership transfers, payment authorisation moves to the controller, and the outsourced team scales back to controls-only or compliance-only support.

We have done this transition for several clients without disrupting a single supplier payment. The key is sequencing: do not start the transition during the peak invoicing month (typically March for India given financial year-end true-ups), do not change the ERP and the AP team in the same quarter, and keep the outsourced team engaged for two months after go-live as a safety net.

Outsourced AP is a stage. So is in-house AP. The companies that get this right are the ones that treat the choice as operational rather than philosophical, and that read the signals early enough to plan the transition rather than scramble through it.