How to audit hidden costs in your company?

Written by: André Lima, Growth, Serena Energia | Last updated: July 22, 2026

Main lessons from this article

• Hidden costs are recurring expenses that do not appear explicitly in the budget and can represent a relevant portion of the final price of products and services in Brazilian SMEs.

• The five practical steps to audit hidden costs include mapping processes, reviewing contracts, calculating people costs, analyzing inventory and logistics, and prioritizing the electricity bill.

• Electricity is usually the biggest margin leak, can reach up to 10% of revenue, and most SMEs still do not have a structured plan to reduce it.

• Standby equipment, inefficient lighting, dirty filters, and old machines are common sources of energy waste that raise the bill without visible return.

• Discover how much your company can save on the electricity bill with Serena Energia: simulate your savings in less than 1 minute.

What are hidden costs?

Hidden costs are expenses that occur continuously but are not explicitly recorded in the operating budget. These costs appear as rework, equipment idle time, forgotten contracts, staff turnover, and energy waste. Because they lack a visible cost center, they can go months or years without review.

In a corporate environment, invisible costs include idle inventory, manual processes that generate rework, underutilized outsourced services, and energy waste. For SMEs with already pressured margins, each of these points represents money leaving the cash flow without return.

How to conduct a cost analysis?

Bringing these costs to the surface requires a structured analysis process. Sebrae recommends analyzing the last three months of the business’s finances, answering screening questions about recurring expenses, avoidable costs, and items that did not generate return. From this stage, the process follows a logic of collection, categorization, and prioritization.

A practical guideline is to gather all bank statements and detailed corporate card invoices from the last three months, separating outflows by specific categories to identify suppliers or areas with the highest volume of recurring disbursements.

What are a company’s invisible expenses?

The eight most common categories of invisible costs in Brazilian SMEs include card and receivable‑advance fees, taxes on revenue, sales‑person time in the full sales cycle, post‑sale rework, freight and logistics, diluted fixed costs, expected defaults, and management of exchanges and returns.

Electricity deserves special attention because it cuts across almost all these categories, affects both fixed and variable costs, and usually offers a faster return when the company reduces waste and improves management. Sebrae data show that the electricity bill can reach up to 10% of micro and small business revenue, and that only 35.8% of them have a structured plan to reduce consumption.

5‑step practical audit

Step 1 — Map processes and identify idle time

Goal: locate where time, people, and equipment—including those that consume energy—operate below the necessary capacity.

• Ask the team to list the three tasks that consume the most time per week, as this reveals where effort is concentrated.

• Then, record the actual time spent on each activity for seven days, to verify whether the team’s perception matches reality.

• Meanwhile, identify equipment that remains on outside operating hours, because this use represents pure waste without productive counterpart.

• Finally, document processes without a defined owner, since work without an owner tends to generate rework and delays.

Quantification formula: hidden monthly cost = lost hours per day × number of affected employees × 22 working days × average hourly cost with charges.

Attention point: leaving production or lighting equipment on outside operating hours, due to lack of shutdown procedures, creates daily losses that accumulate on the monthly bill.

Step 2 — Conduct a fine‑tooth review of contracts and hired services

Goal: eliminate recurring payments with no use or measurable return.

• List all contracted services with name, value, frequency, and internal responsible.

• Convert annual contracts to a monthly equivalent by dividing the annual amount by 12.

• Evaluate each item on four dimensions: usage, importance, replaceability, and generated result.

• Cancel, renegotiate, or reduce what does not pass this test.

Attention point: beyond direct monthly fees, idle services generate indirect costs such as administrative time for renewals, rework from manual data copying between systems, and loss of focus on core activities.

Step 3 — People costs: turnover and absenteeism

Goal: quantify the real financial impact of employee departure and replacement.

• Calculate the real monthly cost per employee by multiplying the gross salary by a factor between 1.45 and 1.55, which includes charges, provisions, benefits, and operational costs. This amount will be the basis for the next calculations.

• With this figure in hand, estimate the cost of each termination. Each dismissal in a Brazilian SME adds costs to the payroll for termination, considering FGTS with penalty, prior notice, and training of the replacement.

• Multiply this unit cost by the number of annual dismissals to obtain the total turnover cost, which shows the yearly leak caused by turnover.

• In parallel, record absenteeism days and multiply by the real daily cost of the absent employee, to capture the second component of people costs.

Summary formula: annual turnover cost = number of dismissals × (real monthly employee cost + termination costs).

Step 4 — Review inventory and logistics

Goal: identify tied‑up capital and unplanned freight that erode margin.

• Calculate inventory turnover for the last three months and flag items with turnover below average.

• Gather the cost of emergency freight compared with scheduled freight in the period.

• Assess suppliers with frequent partial deliveries, which generate multiple freight trips for the same order.

• Consider leaner replenishment processes to free up capital tied up in stock.

Attention point: supplier analysis, contract renegotiation, and adoption of near‑just‑in‑time processes reduce inventory and free capital.

Step 5 — Treat the electricity bill as a priority cost center

Goal: turn the energy invoice into an auditable and reducible cost center.

• Gather the invoices from the last three months and calculate the average consumption in kWh.

• Identify equipment left in standby. Televisions, printers, computers, and microwaves in standby mode can consume additional energy compared to being fully disconnected.

• Assess lighting. In commercial establishments, lighting can represent up to 40% of total energy consumption.

• Check the condition of air‑conditioning filters and cold rooms. Dirty filters and warehouses without thermal insulation force refrigeration compressors to operate beyond necessity, increasing consumption without performance gain.

• Verify if there are old equipment. Old or unmaintained devices and machines consume more electricity to deliver the same service level.

Hidden energy costs on the electricity bill

The energy invoice contains charges that many managers do not identify. Charges and taxes together account for a significant share of the electricity tariff value in Brazil. This means that almost half of what the company pays is not consumed energy, but fees embedded in the tariff.

To size the real impact of this cost structure on the business, the table below shows how much the company can recover in annual savings, depending on the current invoice size:

Current monthly invoice (R$)	Estimated consumption (kWh/month)	Potential savings with GD (discounts that can reach up to 20%)	Estimated annual savings (R$)
R$ 500	~500 kWh	Discounts that can reach up to R$ 100/month	Discounts that can reach up to R$ 1,200
R$ 1,500	~1,500 kWh	Discounts that can reach up to R$ 300/month	Discounts that can reach up to R$ 3,600
R$ 3,000	~3,000 kWh	Discounts that can reach up to R$ 600/month	Discounts that can reach up to R$ 7,200
R$ 5,000	~5,000 kWh	Discounts that can reach up to R$ 1,000/month	Discounts that can reach up to R$ 12,000

Estimated values based on the discount of up to 20% offered by Serena Energia through distributed generation. The actual savings may vary according to consumption profile and the local utility.

To facilitate the execution of the five steps, the table below consolidates all auditable areas into a single checklist. It indicates what to verify, where to find the data, and which signals should trigger a deeper investigation.

Table: area × what to verify

Area	What to verify	Reference document	Alert signal
Operational processes	Tasks without an owner, recurring rework, idle time	Hours log, demand history	Same corrections repeated every month
Contracts and services	Unused services, duplicate licenses, automatic renewals	Bank statement, corporate card invoice	Charges without an identified responsible
People	Turnover rate, absenteeism days, overtime	Payroll, time‑sheet records	More than 10% annual turnover
Inventory and logistics	Inventory turnover, emergency freight, returns	Invoices, purchase report	Frequent urgent freight
Electricity	kWh consumption, standby equipment, lighting, air‑conditioning	Invoices from the last 3 months	Invoice above R$ 500/month without prior analysis

Even with a structured checklist, many managers repeat the same mistakes in the first audit, which reduces the impact of the analysis. The list below highlights the most common errors and how to avoid them.

Common mistakes when auditing hidden costs and how to avoid them

• Auditing only once: the line‑by‑line review of the bank statement and corporate card should be monthly to capture new leaks before they accumulate.

• Focusing only on big numbers: ten idle services at R$ 50 each per month add up to R$ 500 per month or R$ 6,000 wasted per year.

• Not converting hours into reais: without monetizing lost time, the manager cannot prioritize where to act first.

• Ignoring the electricity bill: 79% of entrepreneurs recognize the importance of energy management, but more than half do not have a structured reduction plan.

• Not defining owners: when work has no owner, the cost tends to diffuse until it appears as missed deadlines and delayed deliveries.

Result verification and metrics

After the first week of auditing, defining simple KPIs helps track progress and keep focus on the areas that generate the most impact.

• Energy cost as a percentage of revenue (%): recommended target below the 10% limit identified by Sebrae.

• Monthly turnover rate: monitor month‑by‑month and compare with the cost calculated in Step 3.

• On‑time delivery percentage: monitor the percentage of deliveries with status updated within the agreed deadline to verify the reduction of hidden operational costs.

• Value of cancelled or renegotiated services (R$/month): record each eliminated contract as realized savings.

• Monthly electricity invoice (R$ and kWh): compare with the previous period to confirm the reduction trend.

If the electricity bill appears as the biggest margin leak in the audit, the next step is to quantify how much the company can recover.

The electricity bill as a priority: the role of distributed generation

When the five audit steps are completed, many managers realize that electricity concentrates the greatest potential for immediate savings. Unlike turnover or rework, energy costs can be reduced without changing internal processes. Installing solar panels on‑site requires tens of thousands of reais in upfront investment, construction that can interrupt operations, and years to achieve a return on investment.

Serena Energia’s distributed generation serves companies operating at low and medium‑low voltage in 11 Brazilian states. Through this model, the SME accesses energy credits generated at Serena’s solar farms, which are injected into the utility grid and directly offset on the invoice. The result is discounts that can reach up to 20% on the electricity bill, with no own upfront investment, no construction, and no bureaucracy. Savings appear on the first invoice after the connection period, which can take up to 90 days.

Serena Energia is among the largest wind and solar generators created in the Americas, has more than 17 years of history, and serves clients of all sizes. The contract is 100% digital: the manager simulates, uploads documents online, and signs the agreement without leaving the office.

When the manager already understands the savings potential and how the solution works, the final questions usually focus on the audit practice and contracting. The section below gathers the most frequently asked questions.

Frequently Asked Questions

What are hidden costs in a company?

Hidden costs are expenses that occur continuously but do not appear in the main budget lines. These costs include rework, staff turnover, unused contracted services, emergency freight, and energy waste. Because they lack immediate visibility, they can represent a significant share of the final price of products and services in Brazilian SMEs and erode margins without the manager noticing.

How does the electricity bill become a hidden cost?

The energy invoice is rarely examined line by line. Charges, taxes, and fees embedded in the tariff account for a relevant portion of the amount charged, regardless of actual consumption. In addition, standby equipment, poorly sized lighting, unmaintained air‑conditioning, and old machines increase kWh consumption without the manager linking the rise to a specific cause. The result is a bill that grows month after month with no apparent explanation.

How long does it take to audit hidden costs in an SME?

A structured initial audit can be completed in one week. The first day is dedicated to collecting bank statements, card invoices, and electricity bills from the last three months. From the second to the fourth day, the team records time spent on recurring tasks and maps contracted services. On the fifth day, the data are converted into reais using the formulas from the five steps. After this stage, the review should be monthly to prevent new leaks from accumulating.

Is distributed generation a good strategy to reduce energy costs in SMEs?

Distributed generation is an effective strategy for SMEs that want to lower their electricity bill without tying up capital. Unlike installing on‑site solar panels, which requires high upfront investment and a long payback period, distributed generation requires no own upfront investment, construction, or maintenance. The SME contracts the benefit digitally and begins receiving discounts that can reach up to 20% on the invoice after the previously mentioned connection period.

How to contract Serena Energia’s distributed generation?

The process is 100% digital. The manager accesses Serena Energia’s simulator, enters the average electricity bill amount, and sees the estimated savings. Then, they upload the documents online and sign the contract digitally. No technical visit, construction, or on‑site equipment installation is needed. Serena Energia handles the entire operation at the solar farms, and the local utility continues delivering electricity as usual. The client receives a single invoice already with the discount applied.

Tired of the high electricity bill? Discover how much you can save with Serena Energia and take the first step to put your energy where it belongs: in the growth of your business.

business. Simulate your savings in less than 1 minute.