Moving from 1С/BAS to Bitrix24

Moving from 1С/BAS to Bitrix24: customers, open deals and sales history come over in stages, and the team keeps selling

If customers, invoices and the whole sales history live in 1С/BAS next to the books, moving the sales team to Bitrix24 means carrying that part over carefully. Bitrix24 is a CRM: it takes over contacts and companies, leads and deals in the funnel, invoices and the history of work with each customer. It does not keep the books: accounting and tax reporting move to a separate accounting program your accountant chooses, and that part is outside this page. We export the sales data from 1С/BAS, clean it and load it into Bitrix24 in stages, so the team keeps working during the move. Below: what we carry over, the steps of the move and the capabilities of both systems we rely on.

Request an integration System page: 1С/BAS →System page: Bitrix24 →

What we move

1С/BAS → Bitrix24Customers from the 1С/BAS directory become Bitrix24 companies and contacts — with registration codes, phones and the people you deal with; duplicates are merged before loading.
1С/BAS → Bitrix24Unfinished sales — an offer sent, an invoice not yet paid — become deals in the Bitrix24 funnel, each on the stage it had reached.
1С/BAS → Bitrix24Invoices issued to customers in 1С/BAS are carried over as Bitrix24 invoices linked to the right company and deal.
1С/BAS → Bitrix24The sales history — what the customer bought and when — is written into the timeline of the company or contact card, so the manager sees the past without opening 1С/BAS.
1С/BAS → Bitrix24Enquiries recorded in 1С/BAS that never turned into a sale are loaded as Bitrix24 leads, so the team can come back to them.

How the move goes

Data audit: we export the sales data from 1С/BAS through its built-in open exchange interface and look at what is really there — customers, invoices, sales and which fields are filled. At the same step we check that your Bitrix24 plan allows data exchange.
Cleaning: we merge duplicate customers — the same company under different spellings — and agree with you what is not worth carrying over.
Mapping: which 1С/BAS field goes to which Bitrix24 field, which sales become deals and which stages your funnel has.
Trial load: a few companies, deals and invoices go into Bitrix24 first, and you check them together with the managers.
Parallel work: new deals are already run in Bitrix24, 1С/BAS keeps running alongside for the transition, and the history is loaded in portions.
Reconciliation: together with you we compare the number of customers, open deals and invoices in both systems.
Switch-off: after reconciliation the sales part of 1С/BAS is turned off; the accounting part stays until your accountant moves to their new program.

Automation scenarios

The customer's past is in the old system

Before the manager opens the company in Bitrix24 and sees an empty card, while everything the client bought sits in 1С/BAS.

After the sales history is in the card's timeline, and the conversation starts from what the client already knows.

Deals lost in the move

Before after switching systems, unpaid invoices and half-finished sales are forgotten because nobody re-entered them.

After every unfinished sale arrives in the Bitrix24 funnel on its stage, and the manager picks it up from there.

Old duplicates in a new system

Before the same company exists in 1С/BAS under several spellings, and a straight copy would carry the mess into Bitrix24.

After duplicates are merged before loading, and each customer has one card.

Sales and accounting part ways

Before everyone thinks leaving 1С/BAS means the accountant loses their tool.

After sales work in Bitrix24, and the accountant moves the books to the program they chose, without waiting for the sales side.

How it works technically

For those who want to check: each point links to the official documentation page it comes from.

BAS products are on Ukraine's official list of prohibited software (Cabinet resolution №1335 of 22.10.2025, based on Presidential Decree №601/2024 of 02.09.2024). The direct ban applies to the state sector, critical infrastructure and systems processing state information resources.
Source: impactalaw.com ↗ checked 2026-09-25
According to the same documentation, the platform automatically builds a REST interface using the OData protocol, through which outside systems can read, change, create and delete data over HTTP.
Source: its.bas-soft.eu ↗ checked 2026-09-25
CRM API methods manage leads, deals, contacts, companies, estimates, invoices and Smart Processes: creating and updating entities, moving them through funnel stages, logging the history in the timeline, generating documents, and launching automation.
Source: apidocs.bitrix24.com ↗ checked 2026-09-25
Ongoing REST API access in Bitrix24 Cloud is available only on paid plans in the Vibe+ lineup; the entry Essentials plan does not include API access.
Source: apidocs.bitrix24.com ↗ checked 2026-09-25
The REST API rate limit runs on a leaky-bucket counter: exceeding the threshold blocks further requests with a 503 QUERY_LIMIT_EXCEEDED error; on Enterprise the counter drains at 5 requests/sec up to a threshold of 250, on other plans at 2 requests/sec up to a threshold of 50.
Source: apidocs.bitrix24.com ↗ checked 2026-09-25

Limits

In cloud Bitrix24, ongoing data exchange with outside systems is available only on paid plans, and the entry plan does not include it, so we check your plan at the start. Bitrix24 also caps the speed of requests: above the threshold further requests are blocked for a while, so the history is loaded in portions. Bitrix24 is a CRM and does not replace accounting: the books, tax reporting and documents for the tax office move to a separate accounting program your accountant chooses. What comes out of 1С/BAS depends on the configuration and on how carefully the data was kept; anything that cannot be matched we show you before loading. 1С/BAS is on the official prohibited software list: we do not take projects for state bodies, critical infrastructure or systems with state data.

How to start

Three steps from a first message to work on your project.

01
Leave a request
Describe the task in the form — in text or by voice. Budget and timing are optional.
02
We review and estimate
A developer studies the brief, asks about anything unclear and sends an estimate.
03
We start
Once scope and price are agreed, the work begins.

Leave a request

or write to info@coreviaflow.space

Live project We built and run Gemalli — a B2B export platform with producer pages, a CRM and a deal chat. Read the case →

Questions

Is it legal to stay on 1С/BAS?

The direct ban covers the state sector, critical infrastructure and systems with state data. For a private business staying is formally allowed, but it is a risk — check your specific situation with a lawyer.

Will the team stop working during the move?

No. For the transition both systems work side by side: new deals are run in Bitrix24 while the history is loaded in portions, and 1С/BAS is switched off only after reconciliation.

And what about accounting?

Bitrix24 does not keep the books or tax reporting, even though it can hold customer invoices. Accounting moves to a separate accounting program chosen by your accountant — that move is outside this page. Until it happens, the accounting part of 1С/BAS keeps working.

Which Bitrix24 plan do we need?

One of the paid plans on which Bitrix24 allows ongoing data exchange with outside systems — the entry plan does not. We check your current plan at the audit step, before any loading.