BACS vs. SWIFT: How They Compare and a Better Way

BACS vs SWIFT: How They Compare And A Better Way

Lightspark Team
Jun 20, 2025
4
 min read

Payment rails are the infrastructure that enables the transfer of money between banks, financial institutions, and payment service providers. For businesses, selecting the appropriate payment rail hinges on factors such as speed, cost, geography, and customer satisfaction.

BACS and SWIFT are two well-known payment rails. BACS is primarily used for domestic payments within the UK, offering a reliable but slower transfer process. SWIFT, on the other hand, facilitates international payments, providing a secure network for cross-border transactions. However, Lightspark is innovating beyond these traditional systems by introducing a new category of global payments network built on Bitcoin’s decentralized foundation.

The Payment Rail Landscape

Payment rails are crucial for moving money between parties, but current systems can be slow, fragmented, and costly, often leading to inefficiencies and higher expenses for businesses and consumers alike.

Understanding BACS and SWIFT

How BACS Works

BACS, or Bankers’ Automated Clearing System, is a UK-based payment system that processes direct debits, BACS direct credits, and account switches. It operates by verifying recipient details (name, bank, account number, sort code) and processing payments in batches, typically taking up to three business days. Established in 1968, BACS uses computer-based batch processing to automate and streamline transactions. The typical flow involves the payer initiating a payment, submitting it to BACS, which then verifies, clears, and settles the transaction between banks. This system is widely used for recurring and bulk payments due to its reliability and cost-effectiveness.

Strengths and Limitations of BACS

Strengths

  • BACS is cost-effective, with transaction fees ranging from £0.05 to £0.50, making it ideal for businesses handling recurring and bulk payments.
  • It is widely trusted and used in the UK, supported by a long history of over 54 years, ensuring reliability for both individuals and businesses.
  • BACS supports the Current Account Switch Service, facilitating smooth transitions when businesses transfer their accounts to another financial institution.

Limitations

  • BACS transactions can take up to three business days to process, making it unsuitable for urgent payments.
  • It is limited to domestic payments within the UK and cannot be used for international transactions.
  • The system's batch processing and verification requirements make it less suitable for one-off or immediate payments.

How SWIFT Works

SWIFT operates as a global member-owned cooperative, connecting over 11,000 financial institutions worldwide. It provides a secure messaging platform for standardized financial transactions, including payments, securities, and trade finance. SWIFT’s process involves message initiation, formatting according to ISO 20022 standards, validation, and secure transmission. Technologies like Alliance Cloud, Alliance Lite2, and SwiftNet Link support integration and high availability. A typical transaction flow includes initiation, message formatting, validation, compliance checks, secure transmission, and recipient processing. SWIFT ensures transparency, traceability, and efficiency, bolstered by robust security measures through its Customer Security Programme.

Strengths and Limitations of SWIFT

Strengths

  • SWIFT has a global reach, connecting over 11,000 financial institutions worldwide, making it ideal for international transactions.
  • It offers increased traceability and security for payments, especially with the introduction of SWIFT gpi, which allows for tracking payments similar to parcel tracking.
  • SWIFT supports a wide array of currencies and countries, providing flexibility for high-value B2B or corporate treasury payments without payment limits.

Limitations

  • SWIFT payments can take 1-5 days to process, making them slower compared to other payment rails like SEPA or CHAPS.
  • The cost of SWIFT payments is higher, with fees ranging from £5 to £25, plus possible intermediary bank charges.
  • The complexity of involving multiple correspondent banks can add to the time, cost, and potential delays in completing transactions.

BACS and SWIFT Compared

Transaction Speed

BACS transactions typically take up to three business days to process, making it a slower option for payments. In contrast, SWIFT payments usually take 1-5 days, depending on the banks involved and the destination. However, Lightspark offers real-time, instant money movement, significantly reducing transaction times.

Fees

BACS is generally fee-free or very low cost, making it an economical choice for domestic transactions. SWIFT, on the other hand, incurs higher fees ranging from £5 to £25, plus potential intermediary charges. Lightspark emphasizes low-cost payments, providing a more affordable alternative for global transactions.

Cross-Border Capabilities

BACS is limited to domestic transfers within the UK, whereas SWIFT is designed for international transactions, supporting payments in various currencies worldwide. Lightspark further enhances cross-border capabilities by enabling seamless, low-cost, and reliable payments across borders.

Security Protocols

While BACS does not explicitly highlight its security measures, SWIFT is known for its robust security and traceability, especially with the introduction of SWIFT gpi. Lightspark leverages Bitcoin’s decentralized foundation, offering strong security properties and self-custodial wallets for enhanced safety.

Operational Hours

BACS operates during standard business hours, with transactions taking up to three days to clear. SWIFT does not specify operational hours but generally processes payments within 1-5 days. Lightspark’s infrastructure is always on, enabling 24/7 payments and ensuring money moves instantly and securely at any time.

How BACS And SWIFT Are Used

Payroll Processing

BACS is ideal for domestic payroll processing due to its low cost and reliability, despite the three-day processing time. SWIFT is less suitable for this use case due to higher fees and longer processing times. Lightspark offers instant, low-cost payroll payments, enhancing efficiency and employee satisfaction.

International Supplier Payments

SWIFT is commonly used for international supplier payments, offering security and global reach. However, it can be slow and costly. Lightspark provides real-time, low-cost cross-border payments, reducing delays and transaction fees, making it a superior choice for global businesses.

Utility Bill Payments

BACS is suitable for recurring domestic utility bill payments due to its cost-effectiveness and reliability. SWIFT is not appropriate for this use case. Lightspark can streamline these payments with instant processing and lower costs, offering a modern alternative to traditional methods.

High-Value B2B Transactions

SWIFT is preferred for high-value B2B transactions due to its security and traceability. However, it can be slow and expensive. Lightspark enables instant, secure, and low-cost transactions, providing a more efficient solution for businesses needing to move large sums quickly.

Time for a New Standard

Lightspark intro image

Lightspark is a global payments platform that leverages Bitcoin’s decentralized foundation to offer real-time, low-cost, and secure cross-border transactions, positioning itself as a superior alternative to traditional systems like BACS and SWIFT.

  • Built on Bitcoin: Lightspark’s infrastructure is built on Bitcoin’s open, decentralized foundation, enabling native Bitcoin payments and leveraging the Bitcoin Lightning Network for instant, low-cost transactions.
  • Instant Settlement: The platform enables real-time, global money movement and instant, low-cost payments, ensuring money moves instantly and securely at any time.
  • Lower fees: Lightspark offers payments at a fraction of today’s costs, reducing operational expenses for businesses and enabling cheaper transactions for end users.
  • Cross-border security by default: The platform provides seamless, low-cost, and reliable payments across borders, with strong security properties inherent in Bitcoin’s decentralized foundation.

A Modern Infrastructure

For businesses looking to transcend traditional payment systems like BACS and SWIFT, here’s what Lightspark has to offer:

  • Wallets: Build advanced digital wallets with flexible custody options, supporting Bitcoin, Lightning Network, stablecoins, and domestic payment rails.
  • Digital Banks: Connect to the 'Money Grid' for real-time, global payments, enabling digital banks to expand into new markets and stay competitive.
  • Exchanges: Facilitate instant Bitcoin transfers, lower costs, and ensure compliance, providing a seamless bridge between traditional financial infrastructure and digital money networks.
  • Stablecoins: Launch stablecoins on Bitcoin instantly with Spark, offering fast, cheap, and user-friendly financial transactions.

Emerging technologies and evolving regulations are reshaping the future of payments. Lightspark offers real-time, low-cost global payments, bridging traditional and next-gen systems. Don’t just choose between two outdated options—upgrade to a payment rail built for the internet age. Learn more or book a demo.

Build the Future of Payments on Bitcoin

Lightspark helps digital banks, wallets, and developers deliver fast, borderless money movement — with Bitcoin as the settlement layer.

Book a Demo

FAQs

What does BACS mean?

BACS, or Bankers’ Automated Clearing System, is a UK payment system that clears and settles direct debit, BACS direct credit, and current account switch service transactions, facilitating the flow of financial transactions between bank accounts across the country.

What does SWIFT mean?

SWIFT is a global member-owned cooperative and the world’s leading provider of secure financial messaging services, enabling secure, reliable, and standardized communication between over 11,000 financial institutions worldwide.

What is Lightspark?

Lightspark provides payments infrastructure for digital banks, wallets, and exchanges, enabling real-time, global money movement for Bitcoin, fiat, and stablecoins. It connects businesses to the 'Money Grid,' a decentralized network built on Bitcoin’s foundation, ensuring seamless, low-cost, and reliable payments.

What is the Lightning Network?

The Lightning Network is a technology that works alongside Bitcoin to enable instant, low-cost, and reliable payments across borders, addressing the inefficiencies of traditional financial systems by facilitating seamless and secure transactions.

What are the benefits of the Lightning Network?

The Lightning Network offers instant, secure, and low-cost payments across borders, enabling real-time global money movement. It enhances Bitcoin's usability, supports scalability, and reduces transaction fees, making it ideal for microtransactions and alleviating network congestion.