Six specialist Centres
Explore setup, compliance, wealth, assurance, advisory, and diligence through dedicated Centres of Excellence.
BIG1 Consultancy Services (BIG1CS) is an Indian business and management consulting company supporting startups, MSMEs and enterprises with integrated services across business setup, compliance, advisory, assurance, diligence and wealth. As an Indian management consulting firm and business advisory organisation based in Lucknow, Uttar Pradesh, BIG1CS connects these capabilities to help businesses find relevant professional support across India.
Business Setup • Compliance • Advisory • Assurance • Diligence • Wealth

BIG1CS is building an Indian management consulting ecosystem for startups, MSMEs, and enterprises. Its business consulting and advisory capabilities connect setup, compliance, wealth, assurance, and diligence through six Centres of Excellence.
Structured support for business questions, strategy, and organisational planning.
Connect business setup and compliance requirements with relevant advisory capabilities.
Explore specialist support through the Centre that fits your organisation’s needs.
From business setup and compliance to assurance, advisory, wealth planning and due diligence, explore the specialist capability that fits your requirement.
Business formation, company incorporation, startup registration, and foundational structuring support.
7 listed capabilitiesExplore 02 · CoEGST and income tax filing, ROC/MCA compliance, and related statutory filing support.
12 listed capabilitiesExplore 03 · CoEPersonal and business wealth planning and structuring; confirm the scope of each enquiry.
4 listed capabilitiesExplore 04 · CoEAudit, review, and assurance engagements based on the agreed scope.
4 listed capabilitiesExplore 05 · CoEManagement consulting, business strategy, organisational change, and market planning.
4 listed capabilitiesExplore 06 · CoEDue diligence, verification, field work, recovery support, and valuation services.
10 listed capabilitiesExploreBrowse route-backed BIG1CS services and related capabilities, grouped by Centre of Excellence.
Showing 8 of 41 services
Select a Centre to narrow your searchGST registration and return filing support, subject to applicable requirements.
Explore serviceIncome tax filing and advisory for individuals and businesses, based on their circumstances.
Explore serviceCompany incorporation support, including Private Limited and Public Limited structures.
Explore serviceStartup registration support and foundational business structuring.
Explore serviceSecretarial compliance support, annual returns, and Registrar of Companies filings.
Explore serviceCompliance support for applicable Ministry of Corporate Affairs requirements.
Explore serviceFinancial planning, cash-flow forecasting, budgeting, and management reporting.
Explore serviceInternal audit support to review business processes and financial controls.
Explore serviceBIG1CS brings six specialist Centres of Excellence together in one consulting ecosystem for startups, MSMEs, and enterprises. Explore the capability that fits your business requirement.
Explore setup, compliance, wealth, assurance, advisory, and diligence through dedicated Centres of Excellence.
Related business needs can be explored across one consulting ecosystem instead of in isolation.
The service ecosystem is designed for startups, MSMEs, growing businesses, and enterprises.
Businesses, independent consultants, and professionals can find a relevant BIG1CS pathway.
BIG1CS identifies Lucknow, Uttar Pradesh as its headquarters and lists an India-wide service area. If you are in Lucknow, elsewhere in Uttar Pradesh, Noida, Delhi NCR, Varanasi, or another location, contact the team to confirm availability for your specific requirement. This does not imply a local office in each city.
Check service availability
BIG1CS describes THALMUX as an AI engine for tax and compliance workflows. Regulatory requirements and outcomes depend on current rules and each organisation’s circumstances; information from software should be reviewed before decisions or filings.
Budgeting, cash-flow forecasting, and management reporting can support business planning, depending on the agreed service scope.
Before sharing sensitive records, ask BIG1CS about the information-security and data-handling practices that apply to your engagement.
Comprehensive insights on Corporate Compliance, Tax Strategy, and Virtual CFO services.
BIG1 Consultancy Services groups its business support into six Centres of Excellence: Setup, Compliance, Advisory, Wealth, Assurance, and Diligence. Confirm the scope of a specific service directly with the relevant Centre.
A management consulting company helps an organisation examine business questions, assess options, and plan changes. BIG1CS is an Indian business consulting company that connects management consulting services in India with its six Centres of Excellence; work depends on the agreed engagement scope.
Company incorporation involves choosing an appropriate entity structure and meeting current Ministry of Corporate Affairs requirements. Promoter details and documents depend on the application; confirm the checklist before applying.
Company setup and registrationDPIIT recognition is a separate government process from incorporating a company. Eligibility and approval are decided under current government criteria. BIG1CS lists startup registration support; ask the Setup team whether DPIIT application assistance is currently included.
Ask the Setup Centre about startup supportUDYAM is the Government of India’s MSME registration process. Check current eligibility and application requirements through official government sources, and confirm directly whether BIG1CS currently supports your application.
Ask the Setup Centre about MSME registrationGST and TDS are separate tax obligations, and applicability depends on the business and current rules. BIG1CS lists GST registration and return-filing support; confirm whether TDS filing is part of the available service scope.
Explore Compliance servicesBIG1CS connects businesses with support across Setup, Compliance, Advisory, Wealth, Assurance, and Diligence. Service scope and availability depend on the specific requirement.