Spend under management: the formula and what to count

A plant can report “procurement handled ₹80 crore” because every invoice passed accounts. That is not SUM. SUM asks a narrower question: of the spend procurement is allowed to touch, how much actually had a contract or a PO before the invoice arrived?

The formula

SUM % = managed spend ÷ total addressable spend × 100.

Use the same twelve months and the same entity for both numbers. If addressable spend is “everything we could source” and managed spend is “POs from one plant”, the percentage is not comparable to anything, including last year.

What counts as managed

• On a contract you can name — a rate contract, a blanket order, or an agreement with a validity date and a rate.
• Competitively sourced — an RFQ or auction with more than one qualified bid, even if the award is a one-off PO.
• PO-backed and approved — a purchase order raised before the invoice, with the approval your policy requires. A PO typed the morning the invoice arrives, to “regularise” it, is not managed spend.
• Catalogue or release order against an agreement procurement negotiated.

If two of those are true, count the rupees once. The point is coverage, not a score you can inflate by tagging the same PO three ways.

Managed, addressable, and influence

Spend under influence is a useful conversation with the plant head. It is a bad numerator. The moment you count “we sent an email” as managed, the metric stops telling finance anything.

A worked example, not a customer

Take a mid-size manufacturer whose third-party ledger is ₹50 crore for the year. Of that, ₹18 crore is payroll-adjacent statutory payments, duties and a state electricity board you cannot tender. Addressable spend is ₹32 crore.

Managed spend is 11 + 7 = ₹18 crore. SUM = 18 ÷ 32 × 100 = 56%. The other ₹14 crore is the gap: a maverick spend problem and a project-buying problem, which need different fixes. Reporting 56% as “we manage ₹28 crore” would be counting the addressable total by mistake.

Check a number of your own

Enter managed spend and addressable spend in rupees. The percentage is the formula above and nothing else — it does not tell you whether the number is good.

What the percentage is for

Consulting write-ups sometimes quote a “good” SUM from benchmark databases. Those figures depend on industry, on whether indirect spend is in the denominator, and on a definition you cannot see. Treat any single published percentage as a headline, not a target for your plant.

A practical reading, for your own trend:

• Under about 40%. Most buying still bypasses procurement. Fix the PO-before-invoice rule before you tune auctions.
• Roughly 40–70%. The big categories are on contracts or POs; the rest is tail spend and local buying.
• Above about 70%. Catalogues, rate contracts and a PO-before-invoice rule are actually being used. The remaining gap is usually genuine exceptions, not the system.

These bands are a ladder for a conversation, not a standard. Compare yourself to last year on the same definition. A jump from 45% to 60% because you renegotiated steel is real. The same jump because you reclassified electricity as “managed” is not.

Why the gap costs money

• Invoices without a PO skip the rate you already negotiated.
• Three-way match cannot run, so accounts pay on the vendor’s quantity.
• GST input credit is harder to defend when the purchase was never an approved supply.
• You cannot see maverick spend until someone exports the ledger, which is too late to stop the next order.

Seven ways to raise it

1. Publish the definition in one paragraph and stick to it for four quarters.
2. Make “no PO, no payment” the default, with a named exception path for genuine emergencies.
3. Put the top ten categories on a rate contract or a blanket purchase order so the plant can buy without a fresh RFQ.
4. Give stores a catalogue. People bypass procurement when the official path takes two weeks for a ₹4,000 seal kit.
5. Separate direct and indirect spend in the report. A single percentage hides a raw-material process that works and an MRO process that does not.
6. Review tail vendors once a quarter. Fifty vendors under ₹2 lakh each are where unmanaged spend hides.
7. Tell the business the percentage and the rupee gap. A metric nobody outside procurement sees will not change a plant manager’s habits.

How to measure it from the extracts you already have

1. From accounts, twelve months of vendor invoices: vendor, amount, GST, date, and whether a PO number was on the bill.
2. From procurement, the PO register and the contract list with validity dates.
3. Mark each invoice managed only if the PO was approved before the invoice date, or the vendor-item sits on a live contract.
4. Subtract non-addressable lines (statutory, duties, monopoly utility) from the denominator.
5. SUM % = managed ÷ addressable. Keep the excluded list on the same sheet so next quarter’s number uses the same cuts.

Related numbers, which are not SUM

• Maverick spend % — invoices with no prior PO, divided by addressable spend. It should move in the opposite direction from SUM, and the two will not add to 100% if some spend is sourced but not PO-backed.
• PO coverage — count of invoices with a PO, which ignores value. A hundred small POs can look disciplined while the large capex has none.
• Cost per PO and PO cycle time — efficiency of the process, not coverage. A fast PO on the wrong vendor does not raise SUM.
• Contract coverage — spend on a live agreement. A subset of managed spend, useful when you want to know whether rate contracts are actually called off.

Lines that confuse an Indian ledger

A vendor-invoice extract in India mixes several things that are not addressable spend. GST you pay the government on your own outward supplies is not a purchase. Input GST sitting in a credit ledger is not a second copy of the purchase — if you measure invoice value including GST, do not also add the GST line from the liability report. Electricity from a state board you cannot tender, statutory payments, and bank charges are usually out of the denominator. Inter-company invoices are out unless the other company is genuinely a supplier you could replace.

Customs duty on imports is a judgement. If procurement chooses the supplier and the incoterm, the duty is part of the sourced cost and can sit in both numbers. If a customs broker's invoice is coded to a freight vendor with no PO, it will look like maverick spend when it is really a missing link to the import PO. Tie it back before you congratulate or scold anyone. The percentage is only as honest as that tidy-up.

How Procupy handles this

Every approved purchase becomes a PO before the vendor invoices, and goods receipt is booked against that PO. Spend that never had a requisition does not appear as a normal order, so the gap between “invoiced” and “on a PO” is visible without a separate spreadsheet. Rate-contract prices stay on the vendor’s items, and a release uses that price instead of a fresh quote.

Questions buyers ask

What is spend under management?

The share of addressable spend that procurement controls through a contract, a competitive award, or an approved purchase order raised before the invoice.

How do you calculate spend under management?

Divide managed spend by addressable spend and multiply by 100. Use the same year, the same company, and a written rule for what “managed” includes.

What is a good spend under management percentage?

There is no universal good number. Under about 40%, most buying still bypasses procurement. Above about 70%, contracts and POs are in normal use. Judge the trend on your own definition, not a borrowed benchmark.

What is the difference between SUM and maverick spend?

SUM is the part you control. Maverick spend is buying that skipped the PO or the contract. They are related and they are not exact opposites, because some spend can be competitively sourced and still miss a PO.

Does spend on a rate contract count?

Yes, if the contract is live and the call-off uses its rate. A rate contract nobody releases against does not put those rupees in the numerator.

Should I include salaries and GST?

Salaries are not addressable. GST paid to the government is not a sourced category; GST on a vendor invoice is part of that invoice’s value, so decide once whether you measure pre-GST or invoice value and keep it.